Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7498ffbf6e1a95…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 23:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7368864201a53fea9dba33882b08e75 SHA-1: 167d738e337605f15cc7c2b53375e28fc1fbba4a SHA-256: cf7498ffbf6e1a950e0c2859482bee16048a85a707017631bd22075290285aa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for potentially malicious purposes. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=chal+mera+putt+2+full+hd+movie+online+watch PDF link annotation
    • http://dlzj.net/upload/files/2021091104342247337.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/61062496636.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/gaxamalixakov.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5phcpd378va1s10kd4dlcu2na2/33687556603.pdfIn PDF document text
    • http://humanlitech.com/files/files/55878216518.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/50752111283.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/45829680880.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3bq2atiectoclvptd1pi7umr4m/waladorubamusenove.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/japuvibepomipanuxo.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/7078875024.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/dozaduvejukitaliri.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/zexapasuranuni.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/16053952457.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/45809599540.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/fufemoduz.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nrrs1opav01q3fdogh996m1r69/77503571925.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/96869887201.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/zuroxifaxo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c404d0e911---72885376701.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d59628f4503525bd03928a1638116dfa/70150729743.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/solilukireburizipaz.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6241663d031a7643735072c2335edf4b/tikufakutevat.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/68258547230.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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 11120 bytes
SHA-256: 4759765f20ad8710a9cd374cb0734dd6704693bc1c27a9a4159fae10417664bc
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 17424 bytes
SHA-256: a6c59b25fc270be920d5a21e0b2a3b18d903f5f57d14881fa873cc0f26c9ed58

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