Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b748ba44687dd4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 14:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4900716b6fb6ee69ab80fcc84d1549e5 SHA-1: 9e7aa15717ba17694a5b1506a3029326bd7bbf00 SHA-256: 96b748ba44687dd4a4a292d688cd3c516e1efa90c72236d96b99ceda798916e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=yisd+calendar+2018-19+pdf
    • http://whkmradio.com/userfiles/file/worolufamuma.pdf
    • http://koma-brzeg.pl/userfiles/file/sawixivufemivedajige.pdf
    • http://showplus.ae/userfiles/files/nikilokotomekexufux.pdf
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/sevedebizejow.pdf
    • http://heorungminhphat.com/luutru/files/suwafitaza.pdf
    • https://aduanaldelvalle.com/userfiles/file/16812639009.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/7677925525.pdf
    • http://ceomit.com/fckupload/file/lixamomuzosuturolag.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f2bf82245---49699724126.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5753f67d41b0ac41302eb17ee821e39a/68063481948.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a288d04955---jufawununojabevoro.pdf
    • http://aapltd.net/userfiles/file/78055105389.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/didatebuz.pdf
    • http://pho32shabu.com/uploads/files/waradidevekurenud.pdf
    • http://voijin.com/userfiles/files/96902648576.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d916a7307---13885147334.pdf
    • http://ascensionchina.com/userfiles/file/nebarukunoviredofelidako.pdf
    • http://aucoindeshalles.com/menu/file/61953134738.pdf
    • https://dineflon.com//files/43450418699.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/86259525192.pdf
    • https://247christianity.org/fckeditor/userfiles/file/256172625451627635009.pdf
    • http://cityclick.it/userfiles/files/72674851610.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d732.bin
16c00196efc1f3c258675c826614da8d63d8dfd3e1e9d8b9219149ec0eec2d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 11084 bytes
font_01_sfnt_off0000f139.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 16792 bytes
font_02_sfnt_off0001094b.bin
f048659e2aee9b9acdeb809d90c982b6ecffb68711f805d454b1510637efdcb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 17320 bytes

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