Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff92f096bc2de478…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 16:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2651ba909120da894c6b5c5babd9a902 SHA-1: 7d3e7a0bea173b340f898a7deab92898daa106f7 SHA-256: ff92f096bc2de478d14526b80ae921dae64e0a8e2bd3287a1d3bfd382c69169b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript stream suggests potential for malicious code execution, likely to facilitate the redirection to external URLs found in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=lucky+block+maps+for+minecraft+pe PDF link annotation
    • http://heninrealty.com/userfiles/files/91689969664.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/26398167789.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/piruziwugenuwus.pdfIn PDF document text
    • http://infosierra.es/images/editor/84853995887.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/70364655604.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/91185749623.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/rajeduvexi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb4c2bb0c---rasenapisewe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141db1d7e339---matuwupejogevoresunejet.pdfIn PDF document text
    • http://woykoff.hu/upload/file/gefuvuwagodolawega.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/zofuv.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a050d704---18525159508.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/revabazonenaz.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gopodawubog.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/afa8d5ed6ab6cc6996d6e5f5bbe1d714/69844728338.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/rifoxataga.pdfIn PDF document text
    • http://only-svet.ru/upload/files/guwovuligesirom.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/62848804717.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141042a69059---8004984460.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/fafipobarapekuwinuviver.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/balifapozekuj.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/67974853645.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/jorepegefivezi.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/niximuf.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a8a0e90a06eb0d098b70b115798e6c72/fekugopur.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_off0000b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 11044 bytes
SHA-256: 49d787835169542ad750a205721e45b82fb564f1469295254305c17f61574702
font_01_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 16160 bytes
SHA-256: e5577d4894cddae4bedc9735ccb386d7e13a5804ef6dd12cbec716dca197e0be
font_02_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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