Malicious PDF — malware analysis report

Static analysis result for SHA-256 f181edb439d3b15a…

MALICIOUS

PDF

76.5 KB Created: 2021-07-03 07:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 277959aa6bd4ddfdeb71f1cc7e459af9 SHA-1: 77ea828d768fa1e6afefd22dd6f3c6315fcde58a SHA-256: f181edb439d3b15a69ceca0a72a576c8be0944e35c8d8234163580441ee5b289
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://aokman-drive.com/d/files/vufokuzovekepamoluj.pdf In PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce54507626---jedijojajixefaso.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160833240c7656---20579977625.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4af836a549175d8d5f01bc29fb3f5f97/56814105835.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9ae3f60842d4abfdb0aec1ef0692ba7d/56485219057.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/legizileravatula.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/ravatosijiko.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a3de229f30ac8bd345103eb78170748d/60900737852.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160830d7323f17---refogaz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0e232b48---mebisapakunepufofu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/11099506120.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tasezubanope.pdfIn PDF document text
    • https://lasanisports.com/files/73760725952.pdfIn PDF document text
    • http://cecev.com/stockages/files/gitepefileniburus.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/sogajopuxeb.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/20754745768.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/kuwetumasuregutoravupami.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/49084795133.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab209d79a6---sifokoruvufedaferupef.pdfIn PDF document text
    • http://flirdining.com/uploads/files/jorumelovulegusadejibu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b779f2b19---36500539556.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/8f3c6f1d44c8643380350a49df300681/pupemape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=30+pounds+in+rublesPDF 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://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_off0000c898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC898 10560 bytes
SHA-256: 5c2d3f23c0c803e15b62709688964d254656a90b41c3731354ac808431bcdd21
font_01_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 17028 bytes
SHA-256: bd85117583aff12ba05c22849320263373974c35a214afd0ca39cb9af1f5fbdc

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