Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b10456e2440c3ca…

MALICIOUS

PDF

115.4 KB Created: 2021-06-13 01:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ceb7e93a01d3e2562a477d2a86a43912 SHA-1: 3c26ed00cc19fcb1f7fa7f24cd8834824f9e3ca6 SHA-256: 0b10456e2440c3cabad23aa1a792888e34209a405bb9d04682a80b131bfaaaf2
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search query for 'The art of war book by sun tzu pdf', indicating a lure to disguise the malicious intent.

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://garglob.ru/uplcv?utm_term=the+art+of+war+book+by+sun+tzu+pdf PDF link annotation
    • http://churchtextile.com/userfiles/file/66879573064.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e9ba94c7---51479607469.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/29331260426.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608808aa431ac---mokufa.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9flijv82o7rd8ihb3f92p2kmi9/sixirof.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/mikoromidoneborosemit.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098363040dfc---26489457715.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/54965673296.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wimibabofepuxile.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d35a57fc27ff3bbf73e279fb1d34247c/gipezurak.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d730230a4---sajivukinuvu.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/laieok7hc86on886s4a690l5f1/nagawadupurowulotak.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ce6cd0a6441bcf36bdb7a3b470a3dc63/35804959829.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/malakapoferatifutinitigi.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/eun3veka46p6aqand8735035mo/majafagatadorebujadafone.pdfIn PDF document text
    • http://hopsch.de/uploads/file/mezizajogula.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/qaer11ve179imu9sb9k9funcer/7612842784.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/e33j07gc6stomdc95too9hppe4/80820915163.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/24908982106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off00018a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A8D 5496 bytes
SHA-256: c8e7a978370b26be5f150b507914c6623814d5f8c6a5cec3ac78dabd2b5bb34d
font_01_sfnt_off00019d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D52 10144 bytes
SHA-256: 0a9b7d60f4872f0fefe14933401778f5ae22afdc22c0e115523c3dcfa6008e34