Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aef076c66483298…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 12:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d434f9da2a3e273786947ef676b71c0d SHA-1: f03fb56e7dde144b93a2c822deeea63ec136983f SHA-256: 2aef076c6648329802e2c6def0859f24996d58a82237a502ec552901f8dab118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=chemistry+book+pdf+free+download PDF link annotation
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzapuketutifilonigeve.pdfIn PDF document text
    • http://beijingteye.com/upload/files/20045121030.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/13036199327.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/wapexowibabe.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210915_5ABE6051CD49935B.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5f32c4a4f4f36161e5a0b8ce7c8ee93a/4215533883.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fikekagob.pdfIn PDF document text
    • http://bulmarconsult.com/files/zofovidijofobofimorukor.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/gufox.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gesupanebamasejiterex.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/dugosefiwunusukinabaz.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/popopar.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/iq3k85iu739mf3cqtvcpkmvmg1/tafefakugobus.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zukudibegawa.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/56710912629.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/vujaxewi.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/bewomagezutupusu.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/duvefilogefaluxapanobuxi.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gelagutekumorutumedovif.pdfIn PDF document text
    • https://bselink.com/userfiles/file/javikimuk.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/87920802271.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3a9006909f4802fa079b44fdc1594543/84576976515.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/papex.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sunedozekevadujafod.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7630c5a540c67541d5962eb039f49feb/najolovapukuxujikakuj.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_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 11224 bytes
SHA-256: c3eb82fecaaaf2e3ed936ea370678874691adbfcfcb33b8eff82666de4e04b56
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 17972 bytes
SHA-256: bc60f42bfb78b060418ce25d195f968fed61c1e793cb488326d9c7d431d7ba22
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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