Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd07ad153efb1d6c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 02:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e811e3aeccc36e58f00131c4c99ba1fc SHA-1: 6a8467ed7e4b540b4fb9e25162a7c488a7a10907 SHA-256: bd07ad153efb1d6c6bab48b41f067ce8eb6141ca488247d5713b6ba9882250d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=from+android+to+iphone+contacts PDF link annotation
    • https://szallas-karpatalja.com/upload/xobezewokatamelinibezovok.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/zowututigigewaf.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16363816882.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/36588725328.pdfIn PDF document text
    • https://labelmarket.eu/data/file/17863048030.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea35195a2---saponovirokeferamowekige.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/53827498564.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/kifuxem.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/23839832710.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135d8f524f71---92223333299.pdfIn PDF document text
    • http://entrackintl.com/uploads/90560265288.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xibewasexaliteroduvenemu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/11388883e13ed4ecd5e74ed16b13b918/dazelexa.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b8e6e3cea55018fddaeacb4f41cbd8cc/66626848251.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1f74f525a5337fb152142ac132322669/59622813166.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/futitabawema.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/lulebosokowiduralawiwa.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/nelixuf.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/57e8064bd44457d718875911faac1ff8/92791079631.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/kukadogepobefugezikamixo.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/vazulomobalipufufirize.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/36785641919.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d7172db2c2fc073fbeda2e677c6cb06/reveziferexuz.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/rubepisezebifaxisozob.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_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 17816 bytes
SHA-256: 2f04bfc2aac20ed30dfd079f674d4628b4aa78312e1c381c4ad5fb107556ab2f
font_01_sfnt_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 10712 bytes
SHA-256: cc3ec480b256dc2d3864f745083c5107b421e17f3f71256fb2ebada3613db24c
font_02_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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