Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42e876d3cebc104…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 22:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24260dd0ca42f4f88ac067740e90c042 SHA-1: df6561f122043c7f2d0013c991e2b9eaab0d9edf SHA-256: b42e876d3cebc10484984301e16a3079f045a3e210efeaa5323fe714cf6d3741
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a malicious document, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3b6fa02fd9883278a55ddb068ae77562/jijadun.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16104801f111cc---fevurapuwulabono.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/rusosafubevuwofobibotafoj.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ff3d87316686e208b3a5414ebc84f39c/62907057931.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/zejifakaxewesutun.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/56369019040.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/98812884867.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079efff7b341---tetipuxijemefaf.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/50215834825.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6fab9a9f9ecbd0c83a1a393cff7c4fd8/wegoritajiresijozowuta.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec62431a3a---nowakogajofuxejujunafike.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/38692337314.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ea5cf34d---87027478384.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607daec98a776---pufikidilitedesajezoz.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/a75n58mldq5f7s7bqamnm2nhkn/zesubogafejepe.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/41190292206.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/sanodisemukaw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d131835fc0---zufepupepekufo.pdfIn PDF document text
    • http://llux.vn/uploads/files/taruxofabebobugud.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sokod.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/sabixosibidugetabixobego.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/33302773097.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d79d52b5---96045417758.pdfIn PDF document text
    • https://kawanmto.com/contents/files/11317153864.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a73f790d9---77609900052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=debridat+ulotka+pdfPDF link annotation
    • 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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 18780 bytes
SHA-256: fdda3f69bf5d1b395d4e07bc918f11467800ecca8c9773eb6c50f0d565acf1c8
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 10552 bytes
SHA-256: 68ee8afc72dbbcfe3fccf0d61319df5a8de45cd8d530090d81d1fd53076c5dfb

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