Malicious PDF — malware analysis report

Static analysis result for SHA-256 4129669ae31de26d…

MALICIOUS

PDF

93.2 KB Created: 2021-07-01 14:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f6c78d34ee0c728a1310b3aa4530bbe SHA-1: a5366687f458b5b0fd1d87a0aa3b919f6021f7e2 SHA-256: 4129669ae31de26d2952a4408c543c823d0617609cc3a7a106ecf5215676538e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress upload sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/rsd734vpljpnrst3dp17c1jq47/98111496881.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2fab694f665e4a7239c54aabb34bd620/zekojuvivuxijedevatuku.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0812873001620100776.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/torera.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704d983e0c9---13331273052.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f3e444f91034bae6dadab8f7a0976d52/pifiviwapiveg.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb2f554898---84723603732.pdfIn PDF document text
    • https://morabia.fi/images/file/60931695367.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/fokemomidetugadir.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/zosiba.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/17390232273.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/zidukimazu.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202162082364524.pdfIn PDF document text
    • http://rotang.net/userfiles/file/56736985336.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a36c2d0d---xobinipujum.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8b587fc6209facc0caf4ee7ac23c608f/genopamizumin.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/15445171123.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f88436a23f517a3ebab58db50b2dd637/50396142590.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608578c7277f1---bumatotekikikidugisef.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e0c99f9a---ximasesemogofuwapiw.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/jobagawugozi.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/af4f42c8f845c6dba445e61df77f9ed2/30977788219.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/adea118b75d42d5cbca48854ad8d62c1/3069779811.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/98776552544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=confidential+footer+examplePDF 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_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 10624 bytes
SHA-256: 571c6eaf6e3bb4141c9822b16db901571621f26aa07a0c84efcd24be49bfa4e4
font_01_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 17516 bytes
SHA-256: 5d82c432537703515477e3c620237eb6ea499c529e66c95b7f8a62c1107cf26f
font_02_sfnt_off00014e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1