Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f512e69075e59d4…

MALICIOUS

PDF

96.1 KB Created: 2021-08-06 02:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2d61ac68e5b7b200f99bdaeebf4f495d SHA-1: 2e7ff1385a2715edd89513a27e5fe13ee1fb99e7 SHA-256: 4f512e69075e59d4b8f72a2dd0155d08049aa34b0b6b0b4d96a95b105a28c896
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of a callback phishing lure indicates an attempt to trick users into contacting threat actors under the guise of support or billing issues. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://streetnn.ru/data/upload/ck/files/pabopofufexatanifudib.pdf In PDF document text
    • https://coluer.ir/documents/file/kiwagula.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/82143697891.pdfIn PDF document text
    • http://calisnt.com/uploads/files/donovid.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/xupobovive.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9f410e39992fbd7d4da311a0e713f87b/keruvisemon.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d8d101ae22899d05fe476e9051418b47/76959486647.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcfd40933f---nuxurefojelotu.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/47872183178.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4c23e7fc---juvuworewilagomaja.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/935015f08244a3f18e1024187e940b01/40436796323.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/wetad.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cc418cf1c666a21c8f5fb1179072ec70/34391167855.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/65429949925.pdfIn PDF document text
    • http://vuason.vn/upload/files/xisorovurexadave.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/763cd9709b930ceb548f12853da3044e/76213233294.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/68780885186.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/162fcb4074eab2345b1342ed64878068/nomefupewawa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1a8baefc---xuvekarinatagib.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/28344218d31c411ba96d5e895ea22b7d/vokomi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6be2b4ba---fapelawarovizi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dcb2f26ff9f4a3a43692a8fb16c56e0b/kitewovamorunevi.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/78319758064.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/688408c483f0f88d7a2775103df92f3e/nageguvarowejexekikumuwat.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jlkqond2at8iu5uoea1nl6vrr8/viposadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=boltune+noise+cancelling+headphones+pairingPDF 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_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 18532 bytes
SHA-256: f3d5f3fc91c5043c7a39dc89dedfdb67145ea5661fdee6f328b9f69613c5e416
font_01_sfnt_off00014195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AC 10948 bytes
SHA-256: 9373044c708431222610e16eca7f0644eec08b2d9bc284647300295d41d4ea27

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