Malicious PDF — malware analysis report

Static analysis result for SHA-256 7773374433d4c1b6…

MALICIOUS

PDF

91.7 KB Created: 2021-08-26 10:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f911233a18778be469bc50201a61ddf SHA-1: 9a11c5fb18000d254753ef7b42605937268412e0 SHA-256: 7773374433d4c1b684948e9045bbf4b01ea135d9a11d8fe46d3742f9662e02e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous unknown websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs suggest the PDF is designed to lure users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5b41d2360c57d2540602c8372af0ecde/14351565068.pdf In PDF document text
    • http://pinturasoltra.com/images/slider/files/79392386753.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905a50bc53b---doruwaguwidokesumofaveveg.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gurubuvowinoz.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/47c932d9937b8eefdab5c2db5009ac89/50455630256.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bagowofanuvirenomamugemu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/79f56e859f857b4e0c3be555e4a7235c/94963164393.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/164156e7f0c52a8b3fd79dc8e8218e4c/19736327690.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309276c049---29388932293.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/34060945096.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/66427094152.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f2b7d7721627e512e52a10ae0f1afa3b/vipewabogegipija.pdfIn PDF document text
    • http://klpa.net/userData/board/file/viribaketorumibaxasew.pdfIn PDF document text
    • https://businesslife.com/content/file/30708439079.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dq1cbuitvua8e9siela4rudat2/sowejigusajuduxanirege.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/50877295793.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/73958056979.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/ditulofewofurex.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/fifusabotuvigo.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/86772906032.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/baretefabekemuxuzuzubiver.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/13535679230.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d4f2f2fe---molop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+bufo+toadPDF link annotation
    • 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_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 18452 bytes
SHA-256: c83c3f90b01aa4d21661b8c99de889e90111b956071f2a01001fd98c43a11aae
font_01_sfnt_off000131dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F3 10144 bytes
SHA-256: 7df06bea57c6e4a570cbd7e14a2f29878882abedb137d3278b750db01b08c0d3

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