Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0a0b0048f1af36…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 13:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 921f6461cc127a58efa4f301d2ffaf7c SHA-1: efa994d077006c8c117f6483148b1bcaf9ad56ae SHA-256: 0f0a0b0048f1af369494ec56d3101114de511946a6617b1ccc134814b9fcdfff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=top+10+android+apps+2020 PDF link annotation
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/bisef.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/57119449266.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xakovem.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/8675310746.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/57675732916.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/bugajomu.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/48540433726.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/jiluliburo.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/68210066004.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/tizapisonopixisup.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/22771161492.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kadexo.pdfIn PDF document text
    • http://ukrfirework.com/images/file/puzuribe.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/rudajoz.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c46dfb9345eed5034721b008fdfda41b/lobosifusiwexofegelajofum.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/ledizedo.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/98979639652.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/nigivetebagunipufuguwa.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/zejise.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b7b0420d---lobedetuzojisekulo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/lomeguwuzorezuleno.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/fesizenugirosejojuvowil.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08dca604a70793d4dbb03dc03ba3aa1e/goridopamesiberamejuv.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/89343764564.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/fonibix.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_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 17672 bytes
SHA-256: e84133af23ffe9867167a97aa4fdbd78e96baac59d927f4ed6c2573e3bfa393b
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 10368 bytes
SHA-256: eef96c8d8c3c21f4fb43907064630834d4365b6f908ffcc27607742fdbd3565e
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1