Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4b05f9f266176c…

MALICIOUS

PDF

96.2 KB Created: 2021-07-01 00:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 23c2c7d3970eaf93f021e31cda8087ef SHA-1: 600fd626359a7a33e19ad78bbf8112a74843b1cb SHA-256: 7d4b05f9f266176ca8ca37a538304e324bf1fd9299e3f2c571d4cba6f37d7185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lure users to external malicious resources, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://alnahamgroup.com/userfiles/file/17458363397.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6c9ab6042212132af669950e949363dc/jagimamasizikexutajo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/52670999882.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a163854275f---47041619361.pdfIn PDF document text
    • http://armanetti.com/images/meluzekaj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c0442932c0c05d5ed68945444b0119b2/ledafofebi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zurofonojowedinazino.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/badekowe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6559e6320c---46122391947.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a0826e0083ffdd3d6f8420e3740d09cc/9888413075.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/794b1a972983cdc5f30063b1175747dd/nojolujofivekidonilawerop.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49da7b55a---25680986985.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/50bfbb5d022ef09ea3632d743e313b29/42834688743.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085693f7b526---24269157349.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/40958084141.pdfIn PDF document text
    • http://attlas.center/userfiles/file/62497179450.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e2d8b35799be9973cb7d7874ddf66c6b/pizikop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c039462da6a---14344532691.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/07aa2785f3e4a62a747ab2b81d434638/23767544599.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076203119dd1---kebavefewerajusugixagudo.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/80137693915.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/mikalavame.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kmvsoqtgpah7i4bjf2jc5f8fi6/bamiwivejiguriberibiluza.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608941aa21b72---nibadodarimeb.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/kopog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=calculus+for+the+practical+man+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_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 11016 bytes
SHA-256: 3f21ece822aa53b47fd497983ae69026d5e4a39fb319f321a79ef6d4370d0976
font_01_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14404 17940 bytes
SHA-256: a37b961fc7d593d5915bce449844a91b73c94898dea284ec39a07c76904e49bc

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