Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1025a91bd053b49…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 23:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2d28eb78c11002d2ee70258b1040c4e0 SHA-1: f2b945ae1f239a1766b1658ae6be88b9792898fb SHA-256: c1025a91bd053b49a8f59c4d201e4bd7cb4657bbfb785c95c1f55e28f38d1f59
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 0.9905

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://garglob.ru/uplcv?utm_term=euthyphro+apology+crito+pdf PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd010cf0a0---50926504724.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8169299ce960bac73f46294429ed62a6/49871095885.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/17686905549.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/09b90903da483bb6b522035805a25056/60730801887.pdfIn PDF document text
    • http://360global.ca/userfiles/file/pifijevukupuvamajaxaf.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beacd37d0fc---jofajivigusenosuxifalel.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630473889.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xupisevatumubozegizopokuj.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/derefaziriditufet.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c99e1845d353a9327e06d2ca197771d5/61558463668.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hl9q6k0k7pre1v896nkpkjr0lm/59918669780.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/92440964996.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/ruviragugikiguv.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vunagane.pdfIn PDF document text
    • https://ms02bet.net/contents//files/pulowadekotebesuloro.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/80226608739.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2c542ae36c045a5dad0d9f4eee76fd91/5730510145.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160896bc11624a---lumavopabawuzev.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/pagofopovena.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/20d773750e3b23daf53df637a482b592/riteru.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1ff5814429285a6b551f7830001d0137/32430733475.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/30711538147.pdfIn PDF document text
    • https://themalc.org/files/file/jezuxulavusuv.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/20c680c8d5b8f7f4baf8b2b60dfb2a48/70141423474.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/55622118741.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5919f48c5daefd4a61ab7ac9c980531a/labikirobatuzaz.pdfIn PDF document text
    • 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 10692 bytes
SHA-256: 7d3ea344cfb6f09a50f0df7237cd9c260a0da47eb2abf1bf02d9302569986dc1
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 18504 bytes
SHA-256: da15b82496b8b53e50b7299ea2a0b47cb9d1c38b7b599112336a430a4db42c2d
font_02_sfnt_off00013617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1