Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af46587a2ee143b…

MALICIOUS

PDF

91.6 KB Created: 2021-08-17 05:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ff74572edff1d3ed2481f66594bbce7 SHA-1: a398f0ae98aab588f0c6ec1830cfed5335e4fb24 SHA-256: 2af46587a2ee143b8b54780a3e3040b4a3f3006d1f20c8c0da40e1550268a4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=guide+for+dream+league+soccer+2020+mod PDF link annotation
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb5c8176b---rukevobexirixamafubotoxes.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/93214070217.pdfIn PDF document text
    • http://ridendo.cz/files/file/35938218865.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb575ac88a---pamidituregal.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc7b7ce99---betuxidaban.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608046b72498f---91799134577.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/607a97f9a3aed7d852df7cd3a1f9c504/fukobuwujug.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/it73b1mkg7fl5d5kvn9sfpdgl2/gigukuvebiduxozuxafimepo.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/daxonaxokilobesis.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/77419263790.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/417632729a0489faf54f75f05593a39a/34730792376.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/dowava.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/38817061295.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090af6d7050d---pivosekuzonomesit.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/90360258143.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/pulagupixapasifuno.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e8ae2193---lejoda.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/96954245028.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/foremopifix.pdfIn PDF document text
    • http://lucann.com/Upload/file/sedinixonefekunig.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/78640736512.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/12607184610.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174449068f---51491753241.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_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 22980 bytes
SHA-256: 1213cf048ba02d45f113906e0f6c0d5f9940a57c393edcfa984c8d912040d478
font_02_sfnt_off000145f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F5 11000 bytes
SHA-256: 722689b2a188fe41a61190155988cd9c9502f9eef285e0bfc8e6954107c72b66

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