Malicious PDF — malware analysis report

Static analysis result for SHA-256 c198ec135f50a5c9…

MALICIOUS

PDF

70.2 KB Created: 2021-06-04 10:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac0eb82b5d43b06b40a4051d640f7af9 SHA-1: cfa6a3295965bc160170adb3a9c16720815df9d2 SHA-256: c198ec135f50a5c9327421c6b8a391fbb463458b189ed9630183650061f4ae56
156 Risk Score

Malware Insights

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

The PDF is detected as malicious by ML classifiers and ClamAV, and contains a link farm pointing to compromised CMS upload storage and disposable hosting. The document body is obfuscated and appears to be a lure for the embedded links, which are designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://alexhoffordphotography.com/temp/files/file/53224385649.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5faa4abda1ebbbf30e85afa0deedd537/natedukajikijuvopo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092105b6de4b---78099123917.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0k87hqleoi6p6b6049ju3ge4bs/41548412054.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/m7q0eno9ltci27lbpi1nl0b77m/nugagitepijuxiso.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ee6474bca1d864bfaf0d61f452fcba57/jisapudoxedozat.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/e5906b3a67ff08b78f0f3d47f54ba920/vavapubijoxopigudem.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/542559d8d8e7a812ddb963016effe718/topagamitow.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f7b5d3e6---wijabodetawivelusobe.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/wixemi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/58817773385.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17b35d564---kubexelupe.pdfIn PDF document text
    • http://ausafe.net/images/art/files/bodukudumen.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ff632ff331f6444e335f17ce2615d03/nolagotomagilixonumejokis.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/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=divisiones+con+punto+decimal+ejercicios+resueltos+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 5436 bytes
SHA-256: 559bbd53822a4a266750a9e864581882b4dabdadb41211382abf4252d77306eb
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 11204 bytes
SHA-256: 1b8337e4db3f7e4c1870f9258c307578455b5b1a6f19aa3cb3056b871d442d82

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