Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef73b3a62efaa9eb…

MALICIOUS

PDF

88.4 KB Created: 2021-08-05 01:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 134e84a4c2a3acca10c011092e2ae5ec SHA-1: 6a0c3dd04d90cf9e0e1a454330afc6fe9eaf0f95 SHA-256: ef73b3a62efaa9ebd8129792dd2ba10d8988b6052e8f2a3ade7651623e1439a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it's designed to redirect users to other sites. The presence of 'utm_term' parameters and links to disposable or potentially compromised hosting suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=poultry+production+business+plan+pdf PDF link annotation
    • http://dgxzz.com/uploadfile/file/dixejojezujaxedivetibuxo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608409c428212---repixuwiriremuduvafolase.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/24995863861.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/981075135.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/59122732770.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/82340973796.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/45135700766.pdfIn PDF document text
    • http://skomi.ru/img/files/file/ralita.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/51253140382.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/bufeniwufozetuzuj.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/tukalevopepi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6d08e80b483c0a06e61ad7b6b4e57bdf/zukikibatotagijugobemo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9fc206d6---92291486796.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/10215695896.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ebcd8737---57427316424.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1f30d29a895b51b59c3e9cd3b1aa0b5f/jenekovixevunavubijuxu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c5fbcf6a---welitefekodudizokitowebo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95e129e42---2115580444.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/ragotejuluzojurobab.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/lukowokolilo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710170041804874.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/89493038702.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_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10968 bytes
SHA-256: b7c8df8d4733d824471dfa5d8ff5cdd1cf5cb076eb660cc2df500569cc5072e5
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16904 bytes
SHA-256: e7accd6292d5444ffa1a726aabe825f081829f71a0ac7eba6968b4b1bfd3fbba
font_02_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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