Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b9cebd776cfa65…

MALICIOUS

PDF

89.3 KB Created: 2021-07-06 20:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b6630576ab005b33e37fbc9286a3fd8 SHA-1: 428036fabd5845d02969b89912b9e8d147b6c36d SHA-256: 95b9cebd776cfa65a21a56dde70d75721d64ec323bad1a02d6f0d8507f724c0c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a lure for callback phishing or tech support scams. The document body is heavily obfuscated, but the presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest the intent is to trick the user into initiating contact with an attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=group+of+jellyfish PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4448896f09---xuzosoregugaxepidizax.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/bc8750daae404435ee02b2ba250c8ee8/gitepebadedugew.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/91054188815.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67759253378.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead2d6d659---73839607366.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0595547f30---lojapisusatodanimurezu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a59479d8f81---49002080836.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wabole.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/zubilikesonomarokixewavit.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/wedibin.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd7f46d763---fuximezatunidozize.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/25344273839.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2f66d15909804adbbaae9423402727cc/74027343564.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f1075a6082cd9cb862ed9b3b9a62afbe/31222897806.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210622_A8577A32B597122B.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/luwazimisixofowev.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/b9j76c0g246rm2fj9l4kn7lpbs/fojulazumulukomuwidupi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf976689ac---74808596601.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160af842c663e8---93769027339.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/31397247201.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b591c02507---xaparajizoret.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd81100584---kowon.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42d4a41ca---6123190700.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e6474a1e---355285456.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/a5kvl6jfj49nisnfkna9praa8s/15547385588.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9b800b10e541620cdca860aea5f5c937/nasuzuzev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 16540 bytes
SHA-256: 4524f65f452647a712db82f9ec91c0b1771d4a92235abbce742b53c3b08e06fb
font_01_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 16060 bytes
SHA-256: 7e09a3551a5f95464d485b0302bb2ea5a0fc1ccd586ad0b46555f182e6907fed
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 10472 bytes
SHA-256: b21c91cc4b47ca62da12fea1965b73ac8e2fb63e190192f8f5b694bd60cecd07
font_03_sfnt_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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