Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ad74b3b882e892…

MALICIOUS

PDF

78.1 KB Created: 2021-06-08 14:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3cec441e4654568f3bb88e6173f77160 SHA-1: 656b880bd34ba63310c947e82feb90f70d2fa10a SHA-256: 80ad74b3b882e8929eaec67f5f8765b1befb53bbcc85ec3bce29e8e96b2b10c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document presents itself as a cover letter, but contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. These links are likely used to redirect the user to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=cover+letter+for+university+faculty+position PDF link annotation
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/dasalokikakelafelegunisox.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/koboz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092199cd14b4---75598527307.pdfIn PDF document text
    • http://sushi-belovo.ru/files/41459499978.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a557a8ee---biginebefewu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6e4d24363d70506435ea67397b2cdd34/nutefi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f46e192c730f6b77839aeb359491acf6/44537789046.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b4cb566d8e75fb0a1f7041e2dd3bd1fc/26287213738.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ab54310465335c938311f5a0710a1dba/42046577085.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zinomikuxegisutup.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d096aee3f---16659239882.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096555d4fba6---gukelura.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8df9a654---69829191506.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 5076 bytes
SHA-256: 3558aa2ea568f0e1c5d5041aebdb808a14bae10fbe003c1b79db0e13eeffdf2e
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 11028 bytes
SHA-256: fb38253d7a8ab26c074e06b80a76cc2d1d961da36c0b13aa5d6047c80741fa29

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