Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b258f43ceb5ee6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 20:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46ae3768450bd217e9fecdbb876a57a3 SHA-1: fb10ddbe3a9cc64fd6a3c96e73d3a2f79d7b0a6b SHA-256: 92b258f43ceb5ee62685a1634b46fdc0b65d25ca47634b503224c1e535fca991
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or revealing sensitive information. The presence of multiple links on disposable or compromised hosting reinforces the phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://robert-zauer.cz/userfiles/file/zusujukizivalanofesuweve.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/welomofotuxilapitarutoluz.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/pekoxetetex.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/07afc489bcf3f999dfc73ce5b4d52514/98537140721.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c4f0d800b6f2d281ba33bacede18b2a1/roguvabozikefibo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6008df098---tegatebubifofovibodod.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/24518998218.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/35134961945.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/13176484570.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/vakemalajewoseput.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/butijokafasale.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/4583577804.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de136732b---20534989345.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/kawulovafa.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/tafadimupujazi.pdfIn PDF document text
    • http://okvin.org/userfiles/file/91310049515.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d555d55fe3a2620741cff867da5acafd/zobisevuzinisutiponisuwu.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/54938608201.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zinokevurediwido.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0a10b7e2---28515799988.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/wiwuzilibipusiguros.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b8167bb33---muxoladunifozatoturuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=amigdalitis+tratamiento+ni%C3%B1os+pdfPDF 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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 18308 bytes
SHA-256: 40ca52e3ee4c4d57992750864af8e0aaa3b413b146d82cd2d203dbf06a3bd018
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 11028 bytes
SHA-256: 5ee6c9ce403190a302fd7db63ef3c8225f0e7d325b624861ccc80293106fcc4e

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