Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e495e5d286ed8a0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 18:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 270ad32aeba754102d8e1765f0fded3e SHA-1: 0b05dbcfd676d46c406312fa11cc6a3639acda9f SHA-256: 0e495e5d286ed8a05fa9fdf09a943c0c62414911ab744623ce60ad4df3ff652b
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 indicating phishing and trojan activity. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to lure users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://laborke.ru/uplcv?utm_term=kamasutra+all+positions+pdf PDF link annotation
    • http://simp-q.ru/userfiles/file/mudodixenaxopitib.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/46293453801.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/pimikab.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/28750706901.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/74076791741.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16323379379223.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/vetivozor.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/58615387399.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/senodugixesabowibavuxu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3418acvcs9el6muqsmhaljc66t/poxagokikotagajilig.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e00b8ae9---38580137402.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/mumojawanonesalanufame.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/ferasivawifugujewerakusu.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/samivetodigoriloriteraxut.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1fbadb03da29e4d36fe0a6a68c1d51fa/84678311647.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/xajoxesavukurerupujelafeb.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/sowijexerojide.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/digotag.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/48018663288.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/titegilirovixax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f0396115923e2f6aaba1bdb5d2a8957f/22502533110.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/39513365383.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210905095613.pdfIn PDF document text
    • https://33mobility.net/uploads/files/jukekogozexoteteme.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/zixawogukub.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/rarupi.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_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 10620 bytes
SHA-256: 7833ecaa6bd2f23147f6a34a0a6cb18d8b7ae4356695c2e57546eabdcbc23531
font_01_sfnt_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 19412 bytes
SHA-256: b1eda28b0850119f3817455b331efbf621704ef92ea31861c200aeb0651cd0a8
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1