Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7488a6f0026c4a6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 20:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84356737884ba0979634ace49d94e6bc SHA-1: 2dfdc30ce42fb3f20312b8d0e5e124983504e725 SHA-256: b7488a6f0026c4a65f162334478c8d50f5a9c79bb8415855bfb418ae5c094cd4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. Numerous URLs hosted on compromised CMS platforms and disposable hosting suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1ea520042049f3db06c4b4ca128b0c30/pegekifibadakukajunatu.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/durulotoxezekox.pdf
    • http://kursadowicz.pl/Upload/file/xawuliwozamabikibebufet.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d300bfdf9---kalexonu.pdf
    • http://personnelstrategies.net/userfiles/file/20880957541.pdf
    • http://parfumland.sk/upl/sujegel.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/91444462706.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/525e9b3a9eaad5fdbd86059c7792f513/80479732849.pdf
    • http://fapannimario.it/userfiles/files/guganeberonujujugisim.pdf
    • http://vitaminyplus.eu/files/file/xizibulixorofoluzajagazu.pdf
    • https://uclerbaklava.com/resources/file/lawasopoturomeb.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bbd302d512e3f81223bec51d955e05c7/38598349755.pdf
    • http://tara77.com/clients/46590/File/96888030155.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/1a15a4e0d9eaa512808afed5da737feb/8410797669.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/zewivozubof.pdf
    • http://landpas.pl/upload/file/85418427934.pdf
    • https://greffedecheveux.center/upload/ckfinder/files/89341714108.pdf
    • http://georgefamilyreunion.org/clients/86186/File/gexawi.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d38c4985220aa81323de610dd29febb8/pibexafusufofevas.pdf
    • http://iccarrentals.com/files/file/soxugiwotefezudawuvuxep.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3240559c8e8d29e0b2bf69268bfb9eb5/36515544805.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fcca11b04---95163892311.pdf
    • http://lhs75.com/clients/46937/File/vokigumadegikefopu.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b26a71feb585f39349ea3b05d4cd64d8/14794692426.pdf
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/5603159107.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=como+convertir+archivos+pdf+en+excel+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1b.bin
7de9fe57d23927a53232b1d1910d45b9008f5909f3bbf0ce44afb9c7e82f5452
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 11264 bytes
font_01_sfnt_off0000e82f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16792 bytes
font_02_sfnt_off00010041.bin
45f6c0c910b9387d2f98b5558d033944a91b6bdc28177f59dc28e63a2d3a72fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 18932 bytes