Malicious PDF — malware analysis report

Static analysis result for SHA-256 9feb916cd8512560…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 13:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 499fd4df4bf3977263a9ebb7f993ac13 SHA-1: 9b72ebb5eadd2c752240ca57c0a59cc62f46f207 SHA-256: 9feb916cd85125600d5263df7b8b0d38ac6627070c52cb4557bb6c35daff95b7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to manipulate search engine results or lead users to malicious content. The presence of ClamAV detection and ML classification as malicious reinforces this assessment. No scripts were extracted, but the document structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://volkshilfe-vlbg.at/images/content/files/garugivaxojaniseriniri.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607581152f639---pajejabusunilug.pdf
    • http://chinahongji.com/d/files/54296301046.pdf
    • http://auxerretv.com/content/public/file/zopuzasiregivoguxati.pdf
    • https://badrivishal.com/media/nisulavonavodofapaxalemo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ad401ce36ef---jemujejojuxuvobubumisajes.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16215888589151.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b31b4fc7ddf787479a345dc51ad7b26a/91807358731.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958f181da7c---98620317553.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ce170c90c3f2c6345dc5be21a7c56c0a/jisitegifenowal.pdf
    • http://infrabud.eu/fckpliki/file/kuzuvanejidutuvug.pdf
    • https://contactfm.be/userfiles/files/zopafitiparamat.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3vdvbd8e62pm5gobgm5458j7h6/zokubiw.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/be845a6458e2554fde76903aa502d4c6/benuwedadafalumi.pdf
    • http://weberstellen.ch/userfiles/file/newulubimatujit.pdf
    • http://satisfytech.com/ck/upload/files/64438884342.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5a201fcdad45dc0f48a75a66f4d0222b/49535220106.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160873611e34ae---lorajixasugew.pdf
    • http://tulga.ru/editor/files/61398277857.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/624d3747e7199bd5be9c183aa6d9dd22/37396118929.pdf
    • http://dnepropress.net/files/file/begejevatepofufoxuwemonez.pdf
    • https://burgas-remonti.com/userfiles/file/62545425277.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d02b126c6---majakuwazedebide.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160965952e6edd---75551210129.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=meniscus+in+knee+joint+cartilage
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
font_01_sfnt_off00010494.bin
ce229d497ea11b00ff22321ac3a8c4a01b76aa47c4ee9a79992d5ffab9387b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 17008 bytes
font_02_sfnt_off000130e2.bin
84c28e5898852a6e76a8ba2e3700d7407d9b94dfe648c0aec51a4f0093393a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 10720 bytes