Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cafaa9cf861cb22…

MALICIOUS

PDF

71.5 KB Created: 2021-06-24 16:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9403d7df805881431d9b9bbd3f4fe8a1 SHA-1: b9f971b77ebd8a01fc3550cde7ca6c17d8b1f65e SHA-256: 5cafaa9cf861cb22cb846e002820d07f98e0a48e65634a546a11dd1bfd779db5
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. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, references 'human hacking' and a PDF download, reinforcing the phishing pretext.

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://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/n7svpu32u6nm7hoi0p0e1f4uh4/8707469977.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d09b71362fc---31324901354.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nitanigogogujodosusa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b874e1631---94064204006.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/ziposugaduzotu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2ffc1aebc5a18ac01afde5a799ed8a61/36219629460.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508061258866475.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/khjfsg38e544vuine41l5dra0b/50671907404.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a9deb32a---10577590140.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rj4kmar4v9hu9gq425iebv3ke4/timesutepuzekaxukilunupot.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/09f4012c411a878f5bf052ad43ad81cb/31664236257.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f145ef00a---28209868621.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/rafezesazabusipaxem.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/netijukep.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u8u44gbo994t5bsdt1u5jkned3/44002985858.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zewogelomovomagagumezum.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/josot.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/BkSY9tpko7c/uplcv?utm_term=the+art+of+human+hacking+pdf+downloadPDF 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_off0000c28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 6256 bytes
SHA-256: f09ab367945106a3d94a8ab634d504869bf2ec1be21c55d798fff6bc161df0ef
font_01_sfnt_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 5496 bytes
SHA-256: 3af851b421fff7967798d96dd0a25b0377419749ce0fb0df92814f155d0b3e52
font_02_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 11344 bytes
SHA-256: 556dcc199e4d79253bd2af7f93ff114ea8e228be6d4abdc21637ba556e0682e2