Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd636e335308afa1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 10:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8313e8558bc20ff68da58f51ac4cd68d SHA-1: aacf2ac18193222d2e3d95b09dd058dbdf0238d2 SHA-256: bd636e335308afa1ced6b6ea41b31da4f0c0ddd33e9e75f8b7e7c731b5b1a5d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to potentially compromised WordPress sites, suggesting a distribution mechanism for malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deceive users into contacting malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448fa859c1a---72864471613.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3l8hscgda7ikh6l9e4erpqu7s4/52578879903.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b3d1971b7---xoberesigewokizitawu.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/vodizonebezonulukufarer.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/94934145510.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/zarosorixematutotatifu.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/49403237725.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/47170070363.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/tobimenuvujejobi.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/19812043867.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/sizebifexijekopo.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/dufug.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/14533407091.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/55254099082.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/46871081290.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zakomadipiben.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/konewojutewuxizupusodigu.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/kalitasogurefonowegaz.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/fklg7rhtn0pq4fds9n68uelje6/22696823172.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/kajefitiw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161446820d9548---tofiziwaxazezori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=anthony+giddens+sociologia+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 10896 bytes
SHA-256: 42bb0a13514c7e7aba069dcc940cd59d5bc5e8b4083424661122e7d2bd351e3c
font_01_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 17928 bytes
SHA-256: 308c007073da0edc701c6f4c1b845b4222d5e83fc04d87c27dc7e1912131b5a3

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