Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1e05901a40ffea…

MALICIOUS

PDF

89.5 KB Created: 2021-08-10 00:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f921be3fc8bda27a6b6747e704b231f SHA-1: 6c963232b3fac530b2436a836d907e71b5003015 SHA-256: 0b1e05901a40ffeab6003c218ce8092c7e6a130bd64d4445902c3544f0d24a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=ver+capitulos+completos+de+la+novela+saras+y+kumud+en+espa%C3%B1ol PDF link annotation
    • https://coastalstudio.com/images/main/file/tuwutewafu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713fcd01fce---kekoxedajuvopuxor.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086816801034---lawubofugam.pdfIn PDF document text
    • https://aspirans.com/files/file/puwovu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/babewuzetaperizesexogeb.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c49d8fcd---86472983232.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/debofu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/48627748376.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d955392dd2---17322447804.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e2a8vlaiqn60hvo02g9ast9jc3/29314776457.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c686700d9fa---fefilasasotezenexunano.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6e7907ca---97891499822.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/kawuluzalejen.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/6590545306.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66758609484.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/zakekovatidibamabujuxuxim.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/putosotidirabojixirapado.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/sekuzodavizuf.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/29162311989.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aq18hrakg41guifkblsh5heai1/mesumajasokirivadug.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/66396246395.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5cd39314d48826809dd0ec7e89f151c1/fiwotepejizenum.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kanavokikiliji.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a855468a173---fagisukumozogotisususal.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 20664 bytes
SHA-256: cc2cb0656252cfaaa2c16a187d41eb8ef31e897563da6c619a620fba0ad5b33c
font_01_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 11220 bytes
SHA-256: e47ce96978e906b85d1a209076f35c799930d0fe955993840c327611ca100658

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