Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c37b580c2e83ff6…

MALICIOUS

PDF

93.1 KB Created: 2021-07-13 05:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8395cb96d94db1bd3e1def497bfc891f SHA-1: 2ce818f0a58376a2c22a5f011b298ba256bdabfe SHA-256: 9c37b580c2e83ff621a8500b9e0dc90c423fd84e26828f10effe834b3e972319
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/431e8418b12ba2d2606bd796839ab8f4/76489901486.pdf In PDF document text
    • https://rmduncanrealty.com/userfiles/files/jenefumeror.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/88e4d2f4a215ea14707a834feab5e836/79922492330.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/56500919713.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a30907be81c---53959045974.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/xufasufapiwusa.pdfIn PDF document text
    • http://accronline.com/userfiles/file/94454663724.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a03adaafe---ropepuzovelakokeraru.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/83307422003.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/gexajawus.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ecb1c239c---deguditexaripibuxe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81a9767d6d2391e1907e973c8f7fbd36/51272214784.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/lagewinefefosuw.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/168tv95m64pbnt3aagn3elh020/zosefidikalolexodinadasa.pdfIn PDF document text
    • http://allasclub.com/campannas/file/13545262079.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hgbe1icqhp861uu11da1qn27tl/lewodofa.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/letixag.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc180474dca---36477074921.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f28c19b24698d6d48cac061631a61d34/52407653260.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/63888891467.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/72865442568.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b2987e46---menemapesebagikijonolenir.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608f54d585f78---21819823458.pdfIn PDF document text
    • https://morabia.fi/images/file/41366196559.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/247b1992e8e1ccf2310f053f4e49a0fc/4026660813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=another+word+for+positive+work+environmentPDF 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_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 10780 bytes
SHA-256: 90e9e7187722305af14b7b938a992068dee3dd9ecad98669bf2ae3a720a1ff5f
font_01_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 17220 bytes
SHA-256: 17a4dbba0e23ca81c6a2f423f6a31be6083a188af31c6a86c3250a80093d84df
font_02_sfnt_off00014cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1