Malicious PDF — malware analysis report

Static analysis result for SHA-256 56410bf4f568ad68…

MALICIOUS

PDF

98.1 KB Created: 2021-06-30 13:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fbc0356434ab435d2503ae3b5f4a7f22 SHA-1: db198ab1bb9c36fff33de9465125fe513b4a3242 SHA-256: 56410bf4f568ad68bc15d4be7b9312363be76ec29bccce0f51305d8064177003
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, many of which host other PDF files. This structure suggests a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ced472f226526bfe69054ec21774d643/50246740340.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t9v9bgiu2f0u8r96q53o8sto83/kazomaj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28226ecd3---7116847927.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea013a6fc5---13912385739.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/96650373807.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/9691420562.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b469982e---wofumemugage.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/rel1ne47vml6ha609ca1mjcvft/42908000494.pdfIn PDF document text
    • http://yuha.be/_files/file/bikuloroda.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c62ca59057fde165c876268115bb343b/jofaxunijubajarukur.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d4660a8b7e069eec56907e08bc29c51c/joxabobaxogudo.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/13775444515.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ee913a26---24873443998.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f9ad018eabe99103f25dc42bad739c86/59014525482.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/xijijapagel.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nugemasojo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/48c14ac895c55116ec90b8f3c93cc193/54239838717.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b46b1b48a---98778026752.pdfIn PDF document text
    • http://www.heksan.com.pl/file/dasoxakameke.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b855817844c344d3c5a8daf7c3079a5d/mofebofopavonut.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5b9e8332---zilalaxuvojupigusabuzopo.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mizedetukawi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075de6903ea5---bosebowuki.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/dusunabonij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=meteor+strikes+reading+answersPDF link annotation
    • http://en.wikipedia.org/wiki/File:Tunguska_epicenter.jpgIn 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_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 10548 bytes
SHA-256: 69d1eed5ea7eb0bbea8766ccb64683f21ac4bab61555a64c3e66a4b9888caf78
font_01_sfnt_off000136e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 16976 bytes
SHA-256: 4199c7a211a3210463db7d10477f610fc37c80573391800bd207db16768932d8
font_02_sfnt_off000162e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1