Malicious PDF — malware analysis report

Static analysis result for SHA-256 314b6f909db5e699…

MALICIOUS

PDF

129.7 KB Created: 2021-06-22 15:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d5ff2c55e3373549f1224cd4bb2e5f5 SHA-1: 56c432baf4cdaa65bc2f08555bdc89d414031571 SHA-256: 314b6f909db5e69974ccb0bdd20c4b360a158ae4dacb7830d090b1592f75cf28
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body's garbled content and the presence of numerous external links suggest a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5631c612d---53505784640.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/389235b4ba61b8f4b86e6ba4acbb4393/53385769565.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a23ad1da91700ca0f2e7c03e7c4965e0/wozudunilezanuzonibitidir.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210519111601.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/baef185d6fbeb7eebb34a005bd46acc4/39201671970.pdfIn PDF document text
    • https://2acontractor.it/images/file/42414884664.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4d36a62d---xubaxefibejeve.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/089f6ddb7113f356ac3b97fa0ab8dfbd/98634627880.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5rc6pund1k7j20n4100mtdhjp7/daduru.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607994a069567---46829221886.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/xuxijutamudazijekinej.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4dc373463---betiwevegamoliwobuwafo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/62903399216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wwe+immortals+in+play+storePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC4 5528 bytes
SHA-256: 32184bc684a86e1ae84455cca56f05f46b610d058ff2da6f6d0f59070d376fdc
font_01_sfnt_off0001be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE27 5172 bytes
SHA-256: 6120a2be9dcad1b58b6d1c76194052a9c11004b41499088612ae9d98c8bd46fc
font_02_sfnt_off0001cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFC1 12624 bytes
SHA-256: a5415e2ba57fd0988d663c12e89c8b4678dd49cc5966c149d923a6e34c10dd07

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