Malicious PDF — malware analysis report

Static analysis result for SHA-256 86df60f2f2cfa2a4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-15 15:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0295ff48e2444ec0b3e552167f99f16d SHA-1: 2582dc8ff878ddd0bf840d851cf7538c6f99d9f2 SHA-256: 86df60f2f2cfa2a49c1b3d3fcd2ceff4b5949e5071e0844fd5b3e3c58387a915
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://chcial.ru/uplcv?utm_term=monster+legends+money+mod PDF link annotation
    • https://factorysales.com/userfiles/files/97350281487.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/dozikojaj.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/70680567771.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ak3ekan0a3mt72sa7ifh8j0h619q8ht2/16732980597.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091419250470554.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/peworajekufuvutimegeg.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/muxetosebipopopawexafi.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/87956019839.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/30663274181.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1b123477ce0d5826491511eeafcad3a4/23671720039.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/mosokopilixanej.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/66105500909.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/87508046533.pdfIn PDF document text
    • https://foulardfotografando.it/file/87512540161.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/vaputaxuleri.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94543830845.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/67348252441.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/41482998629.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/jukadelagunotinapituw.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/bexor.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/nidawalawijusapasupa.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6d0acb1f---worugugidikelusikidanir.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/6477470223.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/12182842851.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/bogeramatopewopenomizi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 24800 bytes
SHA-256: ab9f0e702a7bbfca19029c7d49f38d472aba70d5868c8370c62e1173ff2a31e5
font_02_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D99 10444 bytes
SHA-256: 6dec326caa4235afea301e694e3214f02105d7e943b0bff98ffdc0c128c4e745

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