Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f004992f9eae110…

MALICIOUS

PDF

85.2 KB Created: 2021-07-06 14:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4890a793955f8950ff7367004f1b8ee5 SHA-1: 8a6fd28bf5fa9cfb3914657f2d26d733da4308d2 SHA-256: 9f004992f9eae1105550e482b5c811439921d92b7678d9652b16ac77bb0c307d
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://frutapac.com/ckfinder/userfiles/files/teguwexowatufitaxo.pdf
    • http://artin-intranet.com/ckupload/files/76414038146.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed49565ee---84817953660.pdf
    • http://global-insurance-broker.de/downloads/fovusilal.pdf
    • http://xn--eyt274i.com/upload/files/97503612750.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e6b4c37a3---21808440651.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e688f2e3b---8975802446.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12ece09c5---55384368716.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a39b7a9b---kifobikedapibopasefufavuz.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fd13d0fbd1febb7db68f9e81d0677f4e/gopefaresa.pdf
    • http://altinay-law.com/images/file/68310128601.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/be74585325f3dccc38f80818162e500c/sunawebufupokusozupu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b0ffa3e97665bd5cd08a20ed2015d9eb/turixudikofitebawexopido.pdf
    • http://musorcentrum.hu/files/article/file/tedobugededavazuw.pdf
    • http://dlevitin.ru/fck_editor_files/files/88233261864.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dba8e1dfb8e---87236841958.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1f709df43d981842c8982bf612a0d824/rumal.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4e92a6190018dee66e170d81b42d1146/womisupig.pdf
    • https://capitalsyndic.com/userfiles/file/wofadoxatufupazaxisozesam.pdf
    • https://dbjadow.pl/attachments/file/toleroferufapizuteveleziv.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c633374aeec---11061580440.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6b21808ce92311db2777e2e05f16b6e2/pejajuwutukili.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cool+things+to+build+in+minecraft+xbox+one
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/97c545af9143081f0855090c2daed389/58834849148.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_off0000e992.bin
0ba3c8ff90237934e7407a453251b6ef8a3266390e807c7735138b4e669c9d8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 16720 bytes
font_01_sfnt_off00011512.bin
b0117c4bee26b7a8c5e95346e7190d7c96316f6da59cdd4342eb6f7a19fa2695
pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 11296 bytes
font_02_sfnt_off00012f38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 16792 bytes