Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eaee7d49355d821…

MALICIOUS

PDF

88.8 KB Created: 2021-10-12 14:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb7cd87dfab76004c348c1a78f726340 SHA-1: 0aecd21eab5c6902680eb2b60fa3f82be6a6faed SHA-256: 9eaee7d49355d821f3e01c284140c03aefca4021511af66674db93f727d6ec7b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=night+witch+clash+royale PDF link annotation
    • http://chanhbon.vn/media/ftp/file/roruzufidoju.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/relidoxap.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/jilofufunipawakokonal.pdfIn PDF document text
    • http://ecme.site/upload/files/vutewer.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/11081055574.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/dubetuser.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/58638428935.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/mevizizuwivokomawoka.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/xutipewulebefevenibu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10419eacf---68161280620.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/72416981192.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/69441449990.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/jugowogamugunoxofodut.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161464c6b061c5---39333858865.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/ruxutipenanopiw.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/30863722910.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/fabiguganaviwuro.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiluwuf.pdfIn PDF document text
    • https://grandegroup.net/files/zukemifugizegotekakadezut.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310de9de90e---xajagufeliwibep.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/26397532640.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210901/16304888555828.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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10584 bytes
SHA-256: 4bb6a2bb5e527f2bd7c08c14942d7f3e9f3e3377cdf2a539f7118b8a943d954d
font_01_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 19188 bytes
SHA-256: 6a93e02b8c23ff35baf04b7a4b05be8dacada6707428f5e821ed941687bf5b40