Malicious PDF — malware analysis report

Static analysis result for SHA-256 d944b535753fa3cc…

MALICIOUS

PDF

168.5 KB Created: 2021-09-02 17:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 269f9a4c2f2f77712a79b135318fadb8 SHA-1: ebb5dab55e790cbac880885b73b57ceb55c8c0d7 SHA-256: d944b535753fa3cc32f07956c5ba78a267e4ff856c06bd2bf3428cd03afdc7e9
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a distribution or phishing campaign. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly implies the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d73ba4f272e986214b76a381a197a3db/motov.pdf In PDF document text
    • http://henri-ruch.ch/doc_pub/file/65315585825.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/71779fa2772bc8d5fcaf7d7b06659369/renusez.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5225e76d5e---befoxaworolevuduvidivapex.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085641ec9b3a---79093166863.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/49616215656.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090632f060da---51512367894.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/545b79e383c337a2ee7cc46cc20d4023/fepawanizokusa.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/52933347825.pdfIn PDF document text
    • http://flirdining.com/uploads/files/26838737575.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a791f2b0ba---11939194094.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ac019bb844c77382478572db04816781/tisexobo.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/xamekidanijapusujenobuz.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/a26254e8bdf72c17c35ec847d3db7b2e/72491669688.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/97253012801.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/xadelad.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/surofabisajubegobas.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/62693102842.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//69977255298.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/31672004770.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0808c3b552---golupofupiputugikaka.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d48f40e8f0f---fixufamigalom.pdfIn PDF document text
    • http://jngf.cn/files/file/kevikavidozedopi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/lafuxibafovipawuvusolat.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pigovevevevilakimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=osstmm+fran%C3%A7ais+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_off00022909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22909 22224 bytes
SHA-256: 7c1bf0ad73014d1794db4a1708019bb5359cea8207fa6759fea5a10267b8265d
font_01_sfnt_off000261a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000279bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x279BC 10584 bytes
SHA-256: 1687f3a39a7a71cbdd726de21015c5b17ee1d778ee41983c991d7b5b1262a81b

Open this report in the interactive analyzer, or submit your own file for analysis.