Malicious PDF — malware analysis report

Static analysis result for SHA-256 2341ae6cf91044c9…

MALICIOUS

PDF

66.6 KB Created: 2021-05-15 14:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: ed8d862959ca2d29553e4da0a1b28229 SHA-1: a41af455224db98f384f528a30b89940f2c756e2 SHA-256: 2341ae6cf91044c943f9507445d5a8d1644cc4308009270e992ee506f093dfb9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of these links suggests the document is likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=human+resources+information+systems+analyst+salary+texas PDF link annotation
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d816c1c414968504aad566f8536714e5/58886516571.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7df80a0d7---filenupigixinusivar.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/50674294886.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/dc8815b442ca7ebc2da675419a4b4c82/sexavu.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/jogaxiji.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a2fe02ef---siwizot.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9fvs9vbh75at37s5rfq6tq2130/gejab.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0f43339cd00c293945b2f3939c120943/gemamumibuvega.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/87f98597e5ebbac7fe1d1b631b906440/6059356387.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd0d71924---jujemofejamurulew.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/d6e70b908be80ecaada453a2212960f4/munaxutubixepuxiximowizaj.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/epcukjp81il33qi9g6mhrubh9r/vulawewofis.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741665f3952---1038943312.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0b7ecdf6---bopobiti.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d450e95b7086942b0e7f47600c275534/fulavukutixogegozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 5156 bytes
SHA-256: 54c01d5350f4cc5d9901078ae9882942a08b95e13a3f35556df5061c85c4eed0
font_01_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 9816 bytes
SHA-256: 8eb8cd467e73ea2a9f3811cda25f719fcadfbb98b1b5460e355a12cd3c3e1be5

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