Malicious PDF — malware analysis report

Static analysis result for SHA-256 942811f03f4d6925…

MALICIOUS

PDF

93.9 KB Created: 2021-09-06 19:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be938ade9339637a6fc81e4968105603 SHA-1: 11ceb6ed64d0da9d1fadd2f99257bada44832157 SHA-256: 942811f03f4d6925757d4dd684ef246b264c8d5ac524ec726b22704965f40b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://hongshengfish.com/uploadfiles/2021061401364259033.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/t7m5hcujdef014n5pulf6jbaob/19098717009.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33869346812.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/48827651500.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/94372625355.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/guwujen.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/46d8d233b5d07922911874ea98432020/gatuvovutavufoxajam.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74a1d5184---19296847872.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82642228196.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5b8a0abda9f798ae34af81abbb1a48d1/61346826204.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0a882fd2d---xazidobudukekixesowi.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/xupukefopegidofililofonu.pdfIn PDF document text
    • http://armanetti.com/images/83558368335.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/48486848757.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/68134378241.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085c11c0b7c9---12552295371.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613511412b95e---75429908048.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d0977c8c---48500358320.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/009d0fd02e433ba6b902765afb99b90b/dosekafurofod.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/jazolovipugexo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/navujisotubi.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/zavakekutemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=characteristics+of+underdeveloped+countries+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_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 10912 bytes
SHA-256: 1dc28753ac7033e587e0b006aa44ee8bebe47b0898bff32ff8b9a44e47060b57
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 17304 bytes
SHA-256: 17c57207dce3a9c3263117ca7f0129a89b3bb2929e14e0e8c7136cdcb2ebe0e5

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