Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc269a734b4e9220…

MALICIOUS

PDF

70.5 KB Created: 2021-04-30 07:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02385dc22a60b2d38930aaf94cafddc8 SHA-1: 593b970cd40cfa8fb45687f71cc1397fdbe02a98 SHA-256: bc269a734b4e9220ad802de746e83db1def5f05183f21b477ddfb34e39ca912a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or scam purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6f9o389q1u5gs4brr499igvv96/69104098937.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae688db88---39113755354.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a159c538a---66804467676.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r1hmbjid84qnge6vp6ardi98o3/tujabugabosezalopinumep.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce26b8ec4---52041992626.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/r6dvmt96dcobo7bq3cble7mfg7/94211246849.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c5c29baba3af46a90a691c8ab8dd7b19/zigewuvaf.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/791ea6c35f50e27d6deb822fca3f9810/bolefoxefusifomafamiti.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080238d77c82---1888046849.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9f3c5c6a---zejozo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608269d915013---27773302711.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c9d2912b---kunimopoxejovamuxuvo.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a6ac3324---lafabosusi.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfc6dc12c---ropexaka.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6vun4o267vh1r5jfkn4un6pjo2/61999913806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=baaghi+movie+full+hd+video+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bf.bin
2ff6b18e4d8727ec452d3667cbc2c40b3a541363b7e54b203a7ee61cd99f92cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 5332 bytes
font_01_sfnt_off0000e8cf.bin
e0f9dd594f47fe68e161d40127acda0e659cac7073626b7ef45a934b4ab9ba5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 10724 bytes