Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dad0a76eb5bb6ff…

MALICIOUS

PDF

94.9 KB Created: 2021-06-25 17:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e04aa389e69d2f1c19849cf73ae4455 SHA-1: ceb26ea25272b5d47f3596fed8b623463f1f0f49 SHA-256: 6dad0a76eb5bb6fff691d99d5252349b7f58c617d2e8e3cd71e6336668a2e031
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. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for fraudulent purposes. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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) or Microsoft license-boilerplate 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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d33877aa72242624de5d1da909d0063e/kisajamofuwivepatuwadazos.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7be4380d9---famesejavegudo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/memivozezezomanolufizid.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/tikikuwukesozorozilidagom.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c5a25475---70456325725.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf11414ac70---6559274834.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d5edd425a594a46552b4e6d5a6a7b2d1/bofuwivevizima.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bl6245t2di38mos1vf2pddvh23/27179196866.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c65510ea440---87431190509.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd5c372a2---jisozi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa54f8921a---32866037643.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/87c12ac3a440931bdc82f7a45331751a/25482215578.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/14969951381.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lu9bnak89drjr679tdfra56o9e/kofikazedutoboz.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/504862497.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/32486932036.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/21621926252.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/91b078e070acae5fda98bc2618ef112d/xuzelokubiseguxofox.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/nidigopumatagilovune.pdfIn PDF document text
    • http://marymo.ru/uploads/files/gamogoxelava.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/rhq530eog4kkek7c40ggqpkg5d/35002687848.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9ccd1e0a3b7bf3afff8aa38806eb74c9/tororejoposuxipem.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/318080ee3551c5dbb5d65a36ce46baa0/dezesetukelonovasubeval.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zanetevomewijuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=extra+digits+on+hands+and+feetPDF 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_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 16728 bytes
SHA-256: 651850e1d7a09b5951de25ef67de52b2fca0aa8721499795804a659ebb9b12f9
font_01_sfnt_off00013df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF1 10672 bytes
SHA-256: 9569d37ebdebd21ac226bfd45ba61e0c9f1cb1c9db83e334bbc55267d37d2d5c
font_02_sfnt_off00015626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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