Malicious PDF — malware analysis report

Static analysis result for SHA-256 76852029355573e0…

MALICIOUS

PDF

88.9 KB Created: 2021-08-18 11:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 97e06f7d9e69213132112b1ee6d6391b SHA-1: eee95f0f1e87c86fdfab0ca4953fa0053219509d SHA-256: 76852029355573e03cc12e9f3879fc47290dc119329821032508bdc16c0fedc4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm and a callback phishing lure, suggesting it aims to trick users into contacting a fraudulent support line. No scripts were extracted, but the presence of multiple external URLs, some hosted on compromised CMS uploads, points to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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) 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 http://evola.it/userfiles/files/7726679710.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8e1bf1dfe57a35556008dbb50a6f3e89/rubufo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075194de25bc---36732737159.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e9e290ba---52194909945.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/65790148853.pdfIn PDF document text
    • http://banquat.com/userfiles/files/96025313263.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/42504689936.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0080bb5e9a---sovexepilotonapozulaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc00c94a2dc---76506405952.pdfIn PDF document text
    • http://cissi.it/userfiles/files/2118961921.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/87485385583.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8acce316f3---77687731972.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/51a524fbde8d14fa7ec4daab9ecb5225/femevupolada.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2da1f8hbhjo3ci4a9t2adc1d0q/subamegujaburuf.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///romorow.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kizewoxifimine.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/remigowidapiref.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pogadatotaket.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/90223986334.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51989cd05---peraj.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e0f9c1134---27254840398.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kkrl2f7ciquuot9pevlcogvbfo/kanefidiwat.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3ff4g2bu1hptnq9abefts1vhi4/kelolo.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/rimoxukujexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=satyanarayana+swamy+vratham+pooja+in+telugu+pdf+free+downloadPDF link annotation
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 17688 bytes
SHA-256: 2b80389a875e721faeafa41edf43cf13bc6c2c44346bf5d1c6b37d33b592f294
font_01_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 1864 bytes
SHA-256: 3ae51fd610f93fda52280d3587598879eb616076db170d3bcf8e16b1a7bbf2ef
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 11516 bytes
SHA-256: 1a6aba8ea0fd7be6ea87f09f157c8719bc1d894a17fcf4af6f93edbd20f82c04
font_03_sfnt_off00013c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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