Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69136f488582686…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 07:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aa1da066473ab5a9afcd83e89e8b595 SHA-1: 52e2f272ede4c4e1e4bf648be673fdbb5456429d SHA-256: c69136f488582686dd7311146afec157950971521d8e20d9626707181fe6d966
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs and link farm characteristics points towards a phishing or scam attempt. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a callback phishing or tech-support scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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) 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://stalbeckers.nl/userfiles/image/file/2425062819.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/73160643203.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/17449041489.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/vizefaduxegopagaw.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/90099506661.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/7819759421.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/86452371561.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0dca0e5bc3bddabe41be3f446afa5ad0/popewovuwudiniluvami.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_181FBB6525767F0E.pdfIn PDF document text
    • http://shevtsov-art.com/uploads/files/fexuxepivulo.pdfIn PDF document text
    • https://atrax.hr/files/togid.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/63409001734.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/050358a18549b8bebb362062ef6a7d05/84527852258.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/sokilizinubezosevux.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/vowugipepivinosawusuwop.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/74726180089.pdfIn PDF document text
    • https://esz.jp/img/editor/files/tonusagapog.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/kapev.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd7a40887---23840966896.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/91635141284.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/11573482849.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210918063503.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/61383767922.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/48738122756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=generator+robux+no+human+verificationPDF 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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10836 bytes
SHA-256: 538c21fca4510cba355de6662ca12aaedbda0c82e56b858bab13321ef4fbda7e
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 18460 bytes
SHA-256: d574ece090df9d2014e2b02610707d5c649fa1bb4bfbd16d3da6d05a71acdbbc
font_02_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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