Malicious PDF — malware analysis report

Static analysis result for SHA-256 14610d8f12ffc7d0…

MALICIOUS

PDF

105.5 KB Created: 2021-09-05 22:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8cfb273970a42e940fd818cea6ad3ab8 SHA-1: 8bdaaa050e5308c5d3e4cb15851e45527932fe9a SHA-256: 14610d8f12ffc7d03a548209e2da71419be19bfae44e9152f372ba4181b21771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://synerhu.ru/uplcv?utm_term=istoria+romanilor+academia+romana+vol+10+pdf PDF link annotation
    • https://escaletravel.com/userfiles/files/59049438003.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/25679377132.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/moditoxawi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3279551f985d5e68651d962d642d6afa/mogonimukiri.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/duwadixapojapi.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/15861616472.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/34224558469.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d6c27ac9aea221c45a084caa402c569a/92558677224.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/7963984487.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/73871717244.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c933d344---92959175513.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/62768137529.pdfIn PDF document text
    • https://ferropula.hr/files/raxezil.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/k5sgsdr63peu2ebki2ascb33fe/bunijanufibolif.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/jakazezexigegesevepot.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/sakatapudobedabubof.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6babce42b---gogaxomekis.pdfIn PDF document text
    • http://houselandia.ru/files/puzodegakadu.pdfIn PDF document text
    • https://senhewood.com/d/files/34428947725.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c68811ee4---23578758548.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/92960249123.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d7b35a33---kebuwigar.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b4suumkfsqrmsec19tf624rk92/39713875679.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 20688 bytes
SHA-256: c6c899a7b3226670a7b58d0ddcc03480dec7d8ad3148a27f66db5ce8a32eb0f5
font_02_sfnt_off00017e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E6B 10972 bytes
SHA-256: 1bb9770ef285d6480877fe5f82bfc68720f42ff07fc152a75e1a3c733b8607cd

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