Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2c05537ac80e90…

MALICIOUS

PDF

153.6 KB Created: 2021-09-04 02:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bae0059784406b9404cba558307e298d SHA-1: d262bcd1acf51f7b1442f47ba8082e59303e6439 SHA-256: 4e2c05537ac80e90be6fa3e5d8a54b29a3f066bae7e36112ce44b48af65b7b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=seeley%27s+essentials+of+anatomy+and+physiology+11th+edition+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4769d7acc---miwekikutonujibiwewopuw.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/01an99ukanmkpjb28iokgi5ms7/92757904013.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e20b5e8df---lowanusuvosirajaji.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/54446114f115be3b673f7c4cd7b6993e/joriwe.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/96308799047.pdfIn PDF document text
    • http://119pump.net/d/files/setepaboxam.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4bad82d8---gadagulagekavod.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6715c52623---42244234445.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892dfa99366---19718061685.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/tuvejinovinimigojusez.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/46806062085.pdfIn PDF document text
    • https://panama4d.com/contents//files/39286138012.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5f77621f---ruraridagerawewamajufo.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/60434276867.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/gedojuzetapalafigemezam.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/67050071450.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078119f8675f---57744725994.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/vedafoweduv.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/64920580914.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/93bd0e0eafb7c6f1cdf6034bb76dbce0/rugudupitaxexeberazekov.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_off0001edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000205d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205D1 22144 bytes
SHA-256: 5c9ae4ae0ba9c4b904ad86ffb93da0455a38d4a0df06ebe067958f4a9c0c95c8
font_02_sfnt_off00023ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23ED1 11120 bytes
SHA-256: 0326b7a68f46ac6f2442db0ce5e3177d1213611a7d43680e416852c70b68530e

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