Malicious PDF — malware analysis report

Static analysis result for SHA-256 35df9c1be0809c40…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 05:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3adbb6ab4bc2f95297481241d2d4ff9b SHA-1: d657da16be9f36e778f87a7e7740de45f78fb657 SHA-256: 35df9c1be0809c4050e74cb87c9f0956e84196d52388aeff0818a8e73668998d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ciaooo.ru/uploades/userfiles/file/pebakogagifapimen.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/befimiku.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e4be4796---nesuperurojuxedeku.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/97944906448.pdf
    • http://abwingsmd.com/uploads/files/77975956295.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccc60fcbe---tigopanoniguxuz.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/c78lvpof1o858m7j1sp106hvcn/3139883385.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/lopidedaz.pdf
    • http://hoachathoanggia.com/userfiles/file/bukoziduvelonidutuwufaxa.pdf
    • https://landbondcorten.com/attachment/file/36f41b3471627db7dcb807b49db81729.pdf
    • http://varosom.hu/userfiles/files/12630795686.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d2ad4c20fb6f930908dc43cbfe264e59/7320669075.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/62ca27d7408119308f79965cee94e4e0/vapifudiwexej.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3bf5c662a033750bec7596aa838999ed/guzuterubaxek.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121000628142---45749015075.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8livvm8v8e4fu10986gorqc2m6/manewuxej.pdf
    • http://mosjob.ru/images/file/texixasefofikavip.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2rujoaob1b1dbrlvi5vmht3uu2/wexanakazemi.pdf
    • https://bamor.org/userfiles/file/dinapofegijuf.pdf
    • http://architects-desk.com/uploadsfile/buxatiterijatapodi.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/eul1qc1l9s5lh7tnt2q05rfl0f/mopabamabubaz.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7adafdbc90c525f3940cbfbb163a37c9/87571049692.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tiroides+definicion+pdf
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/rurolimotoz.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d449.bin
d63cfea85f4d42deee57a875afa1b5410b3e6f20f3be86a0b4e4d560f23866cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 17576 bytes
font_01_sfnt_off0001021f.bin
bc5f07276933369e71ac063aa4bc7ef7fad97f93cb69cf2f66b7589ecb840440
pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10268 bytes
font_02_sfnt_off00011947.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16792 bytes