Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9bc07aed63e1fa…

MALICIOUS

PDF

74.9 KB Created: 2021-06-18 01:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dbb2d8c85885d76507f8f1d7ffb1404e SHA-1: 94c9ba167e49d18885c0c7aed4ac0e134227ede2 SHA-256: df9bc07aed63e1fa5b3b127896e396f91694970998ce00b37eeaad3e535ee2c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple external websites, many of which are hosted on compromised CMS upload directories. The embedded document body text is garbled, suggesting it may be obfuscated or corrupted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gernano.eu/gfx/userfiles/files/42097938501.pdf In PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/a6b9cd74c86c9fd3590630b0bacfccc1/98583133062.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483e107645---vizagirovedila.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/ruderinex.pdfIn PDF document text
    • http://goref.ru/files/file/45253608347.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tmvvl2n58hltopug1f3mfegl91/dotevuxememisuxob.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/46643505067.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1405ca8022881a687a7768b63ccba5a9/13456992078.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962afc8879a---92922012172.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b08a6ac4---pituritagamovixusojo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9bb5a37d9e326b667eb1c1aa90e73ac7/21070470339.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41e999681---sajukoj.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b769798f7c1---vojol.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/44pp7e4egnbppg4vfuio9tv956/11817570745.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/01c899686321dfd5a6bfa5fd5fc8961d/jadafixarokuluburabo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pyar+naal+na+sahi+gusse+nal+vekh+leya+karPDF 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://scripts.sil.org/OFLIn 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_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 5172 bytes
SHA-256: 36064e9a3d65567afac1423206c7d204b21f579e1e308beb50959b5630a8b31d
font_01_sfnt_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 11132 bytes
SHA-256: ea2f227a0d6cc7e509ec6a204bcd26c1faeaf394c8658705e079fa1783c26d2d
font_02_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 21212 bytes
SHA-256: a2ea6e023b92adb5f5125f6182b1727e35a1f79141e675ae0fcfff22caf33005