Malicious PDF — malware analysis report

Static analysis result for SHA-256 647d4dc1bab90640…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 07:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4259251ded76d3b9f8002e1f6b3a886 SHA-1: 62c803e66622a53fe54523d5a72debcf0627f64e SHA-256: 647d4dc1bab906407ea4c08fc1261250a481d58a72075153bf462fdbb9cbcb9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=download+cheat+mobile+legend+1+hit+no+root
    • http://erex.hu/upload/file/xininalalipojojupopite.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8810108b87f336ec5078fcf6be9bc583/81942174419.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/62161700571.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adec99c47db---25557271470.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50a9b010e---xuwumebibinoritetujat.pdf
    • http://plncse.hu/php_data/file/64108416666.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a9f2be91667ed81d121b4389b1eecb9c/sofujuk.pdf
    • http://vivaibonomo.it/userfiles/files/sofujogarusoti.pdf
    • http://edelstahl-berlin.de/media/file/nawudaxapopunibufiwosar.pdf
    • https://essaidafm.com/uploads/FCK_files/file/61933612258.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba0f937d17---9559807577.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/16ec315908b5f5bdb53f2eca967cdb8f/maruvegavitanojopomixuxiv.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082792bba9cb---xujedovesuduwovesumakogib.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070abd8257bf---15928838500.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f7c669f959459776afdc40356f123fd4/73481284971.pdf
    • http://mastervgtour.by/var/upload/file/13835884250.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5678b584---78624399568.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/59568775934.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca955e3f93---8348153713.pdf
    • http://architettotamborra.eu/userfiles/files/kujalujobaro.pdf
    • http://angarakshaksecurity.com/userfiles/file/jeserapo.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512ebebc9c---medotebunubomubozozidaz.pdf
    • http://promador.pl/userfiles/file/96609104398.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2678e3ed30---ruroxawixate.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978b4a55c27---47918131730.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_off0000f16f.bin
b8b84d2cfe8b00e0aa1ff1e823edf3f1bb5525dcad7638aebd23fddd1ff6334b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 10928 bytes
font_01_sfnt_off00010a5e.bin
553d600c9a08f78319c78658ac2eee5923ca3cd93a5c0214364c4bc606d116b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16704 bytes
font_02_sfnt_off00013600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 16792 bytes