Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f70c3eddba27e8a…

MALICIOUS

PDF

103.1 KB Created: 2021-09-15 20:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 124c8f2689730cf762afdaec6c8be43f SHA-1: 9b2e9a8c6b72c181987e1aedba867d3d07e8063e SHA-256: 2f70c3eddba27e8a9c9f6ed6e079e9172b06bbf970b95a824fb607b0b90d89a1
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the heuristics and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=oscar+wilde+letter+de+profundis+pdf
    • http://maksimetall.ru/files/94149719709.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/kopusazerovorokadibat.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/vadedupakugot.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/voxidokiripiz.pdf
    • http://karlsbach.de/userfiles/files/55121869254.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/31be303be77f89ed54921dcdb5553de4/48210256855.pdf
    • http://www.s4b.nl/upload/files/nejofadabifep.pdf
    • http://shmgec.com/Uploadfiles/files/91677883036.pdf
    • http://learnazia.com/fck/imagesfile/86043543784.pdf
    • http://balogmihaly.hu/UserFiles/file/jiwumer.pdf
    • https://arvikabc.com/images/uploadedimages/file/99894060798.pdf
    • http://eko-baby.ru/userfiles/file/rubewotiwanibuditew.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0ae2d3255---39160256102.pdf
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/87245394869.pdf
    • http://sxhk365.com/uploads/file///41925053370.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/ladevamediwedabu.pdf
    • https://neurondevelopment.org/userfiles/file/nirexiwugokasavimatugizan.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/51594d625d798d12e954d033bb0fbb85/91918084084.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/91b435fdfc3d7ec3a61b3e6a07e16c5d/safozub.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fuzijalo.pdf
    • https://getracemirates.com/userfiles/files/38875057593.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/dipadarazufu.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9d8f8fe7a2e7dfcd1d0a9fbf3a25e96b/43175735319.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee224027a1---76377828267.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_off00012cc7.bin
d0fbcc4689a0d1070c3a724e83fffd65de1f29b2c9c5b180d9e3651e23fd524f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 18736 bytes
font_01_sfnt_off00015d52.bin
de22f89adb4171580d4768a1ce296e6c5ef7c1a7f98a319e500e5d4acb529a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D52 10824 bytes
font_02_sfnt_off00017684.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17684 16792 bytes