Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3bd6af1e26c096…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 11:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e50c47bcf7109b3da25b515e6836bad SHA-1: 4dde8475a435340d90b9937cdef644c23deb869e SHA-256: 7c3bd6af1e26c0969a4a8f87fc5e9105665b2f68f34a86c7dc391b52df05274f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. Heuristics indicate this PDF is a link farm designed to redirect users to potentially malicious content, as confirmed by ClamAV detection and ML classification. The presence of external URIs and compromised CMS upload links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=network+layer+packet PDF link annotation
    • https://sklepbonus.eu/userfiles/file/18283281451.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/85959911530.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/40476857320.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/81621541889.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/77745647910.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/64698100340.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/dusekitemovuvegiwikuxafu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613200a96e04e---loxad.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/71173759371.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381885c9359---18896835624.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/74860477098.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/43259138506.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/newutexesimela.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/16252196627.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tafeginal.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/winularipakigujedar.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/nubonatenufomeputejube.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/gekifevagenabumomudefekid.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/76528449635.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zetegebawexajozusafew.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/63127979590.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393cffda2f4---vifodupedewabekabazut.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bc53ec1d5b2267eabbcd271dd5c7ea85/80328371312.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugevopuvonafij.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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 18452 bytes
SHA-256: d40d8ad56ad0a8ea1eb5d8fc2a3347602ad936c8e8b6c7312bd40bbf64a420c0
font_01_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 10272 bytes
SHA-256: e6026c8b77ec0259fccaf0615e3a632cce5d618337b8c7639dfa6febec572923