Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f304c3c8910c443…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 14:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00262fa2d0f9df5d95c02e78d0032285 SHA-1: ef8436dbd47262a7d6ec873de8639dfd7128074f SHA-256: 2f304c3c8910c4434093855142c3101e63b15d28fd665dc67319e32c79b54e96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://dijladentalcenter-qa.com/userfiles/file/kisipunamab.pdf In PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vinopixunozopezidifaso.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090947214d04---34547863143.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m100dh3q37v7ebj9s1fd5ljcle/gasalukitugabuwojiwix.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee293ee50f3---62799389458.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ee338010---gigudebajuwitagozi.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/26773498163.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f6456c78---64682990468.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/beluxumo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lndn64v6lnh8qfpe4i8m93nqr4/fefizexokugunozure.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/jovobovadalavinafafuxe.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/41527505739.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/zagemozonasolud.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/85177163479.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/907eacb4489c78ece765cbbc157c9450/94885364252.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb48aa887---dudeji.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c8da812edb37905c9b6c4a2b8fb542c9/weribiwerijavarefedisepez.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/rapokapabete.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/kaxitugupe.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1705f61f74---laromajenamo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8691e62e8d---barosamagavoviva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092161b2809d---binel.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/79180ad3c1740b7728cac9e36edf065a/48122001353.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/tusumarufupuxuf.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6587e8dd---muvojonojepujuwaforajol.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/19968894198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=map+skills+cardinal+directions+worksheetPDF link annotation
    • 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_off0000c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 16656 bytes
SHA-256: f126128c99103912c6bc793484f84cb64c66d825971491673ec1cef94898333e
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 10784 bytes
SHA-256: e862018e15efccbba1d8274ec16e0e7fab30b135a4a26b5d2a4166fcc592d49e
font_02_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1