Malicious PDF — malware analysis report

Static analysis result for SHA-256 e250613308ce3cf7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 12:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adc968feb363b80239e52d090fdc8f71 SHA-1: 0c26a2b68b12d827d494ee3c0720c6389da3f21e SHA-256: e250613308ce3cf7588008f1ba30720db689b2a1792baf367797c0a84d6c60cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many distinct hosts and URLs, some pointing to compromised CMS uploads. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://marupyara.com/fotos/userfiles/file/85443155643.pdf In PDF document text
    • https://virtrade.gr/userfiles_lybo/file/vowitemidapowebidewi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ps86vf7jidvnhn68hjd6vb6tok/botow.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tovurilarujakevunexubaji.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b52da5816---lugamud.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dafogexaranom.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/nuluvowigovuwutegu.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/81496262029.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/ratowogar.pdfIn PDF document text
    • http://fitviewer.info/files/file/titisagapir.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/botawim.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wukivelitofunanoxeboj.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210910_46FF19DD412BF345.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/boranajerudosewokugamoz.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/79340217871.pdfIn PDF document text
    • http://3q1p.com/upload/file/210905112517259501ou2uv2z9ty60.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kitiranerevov.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/30520431251.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/55284475298.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d69e820400c2d3fbbb06516b3c75142b/bosolugiwikowadi.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/magabebuninal.pdfIn PDF document text
    • http://93564497.com/userfiles/faxeneruwibemexa.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/pamemexulegexigababusal.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/3335096396.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/biviruwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+faster+gpsPDF 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_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 10608 bytes
SHA-256: ddbe067edb0115bdfc0ef50e324665d53fb4caccacd757d3ed5af7020204e122
font_02_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 17624 bytes
SHA-256: 5dd781d639c56e25337129599abfe276fa1e517e18820cd712546a2488a000c0