Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c2f86a6246352b…

MALICIOUS

PDF

104.1 KB Created: 2021-06-29 20:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22f908cff0deec0b305bb632c8463a51 SHA-1: 2d1a64a1c82f939eed771c78b69d8d3cfdc5ff11 SHA-256: 35c2f86a6246352bfe9f7e5ad32e2dc5a2b44bf4468246fa834454af0bb82567
156 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://infrive.ru/uplcv?utm_term=different+types+of+persuasive+texts
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/664afaad8e5c72f1d9c9ac78b65b0940/97039885284.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5b7fc722e7550613b0ad80aacf792b25/nenidepefisibezemozav.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735de5b8a03---limefudivezurutaforofago.pdf
    • http://guides2alpes.fr/uploads/file/gawasakanororomonozexe.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160990b7e6c3a8---59274301331.pdf
    • https://hobbes-group.com/upload/files/25806631737.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/14ce0f533e6bbe54925feaabdc9eef29/26962424751.pdf
    • http://akinmedical.com/uploads/file/dowisoxus.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/68562945636.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c98e75a7---riwiguxenuva.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb655f4fd9a---77229412731.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c6dd97164d5831f387720009fc00a12b/wolofolosarexarida.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/95372767688.pdf
    • http://stalmost.pl/userfiles/file/risizafovubufejob.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d48cf86cdeb9d97fe040ec58ee0cbea6/18674192048.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/401449d3da5d98897fb433b7edffb2f9/jaxupukeweri.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/49de5c4fa2f0c679526e1b6957401ea5/pisemulujesude.pdf
    • http://moristas.com/userfiles/files/13949714366.pdf
    • http://energo-winstal.pl/userfiles/file/20826936420.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c079c5951c---67607418046.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160787a0589ca0---dalebuveke.pdf
    • http://fructusartis.com/i/File/82368058116.pdf
    • http://comp-art.ru/userfiles/file/matefiberujunagugidex.pdf
    • http://atdawnwelift.com/userfiles/file/zigefibapafeledabagi.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_off00012ea9.bin
31afd59b54978cdb795ed89abc858a2038e98222d51285cce8ed41f1992c87f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 10688 bytes
font_01_sfnt_off00014766.bin
563b8747173de3aae0d636534148a55da0829f624c2feb8458676dfc94a8866e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14766 19816 bytes
font_02_sfnt_off00017af7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF7 16792 bytes