Malicious PDF — malware analysis report

Static analysis result for SHA-256 415e6dc81da132bb…

MALICIOUS

PDF

88.3 KB Created: 2021-08-17 12:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f2e646b4999cb57f4cf888fa14dfceb SHA-1: 6310898f14cac277ddf5f49ab1320fec9e714e47 SHA-256: 415e6dc81da132bb04e93281fd67a810fc472844f74c473044e903dae1aaf053
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the link farm structure is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://merydian.pl/nowymerydian/userfiles/file/61572464657.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85642ca97---26189138443.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a200df7a8---gixuduzalamarasixoti.pdfIn PDF document text
    • https://lesura.net/userfiles/file/95124376568.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b630f13d2122aee2d040ba178e018d1f/20921905168.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1dd030e5---1170111919.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/79604111571.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/sikafe.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v22s208non07teq5go8atpfh97/63488598607.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/2828715842.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/legavonubogibosesate.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0830183990d18b63f31b1cf8ced551a5/muwajifuvebaj.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/wenipuzu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/41674936581.pdfIn PDF document text
    • https://ovalpolycoats.com/media/76188281504.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/13427162575.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/xesazobivasuraponod.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbada476b3b---89962466678.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/11750394785.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/81e082a4ea6f3e8e2e2008d769a12ed9/jajipede.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727ff81468b---navuvasidonefax.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078dee02fea9---podego.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/xilemuluza.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/88352638977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+v+prostitutes+locations+daytimePDF 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_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 17848 bytes
SHA-256: 9fa26e4d258709834d698b6aebfc150ec42efdfa7b2feb906b99c8c46165310f
font_01_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 10992 bytes
SHA-256: a645c72396748fcba00114530298f42e068dd8ff92da079c432a24b8dbf10549

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