Malicious PDF — malware analysis report

Static analysis result for SHA-256 26faaa337f3650a8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1f696c8a4df0e66c0c0ae5952c8d781 SHA-1: 1d657db5f9289211741212b5e3827018f75284c8 SHA-256: 26faaa337f3650a8ee300d7823e92fd639dcdda70720b22f0e7ba167913a71f3
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 a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=grammar+english+complete+pdf PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081389a699f8---158717569.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/38729122227.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a827052efb---1319735333.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/99319058659.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/bukazixura.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/69044141247.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/simug.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/20416735344.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608018943c393---norakomuxojumidepi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e54b97e27---fumumobarerirutak.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/46020884422.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ird6hvbhs640v33qd98736h9t4/778916296.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd675fe54---fifoxinizosun.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/84170592166.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7797c5d2f8138b6f159ede4ce7ce1df3/waletiwimagupilovodajizen.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/61143091559.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/xutelamakas.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/guxeluximovefiku.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2724eb02---80234210073.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/12122915634.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300446a7792---zujelutajudogalaviser.pdfIn PDF document text
    • http://coumert.com/images/file/dipagigibonajunid.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hmchodjstt81a7nomps5smqv96/96209523902.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vlo73db14vgbru6reurkrun7vj/8126226709.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_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 18076 bytes
SHA-256: a329eab26b60787c2a2ede55800947abe02e6a23a71dce32b287d3eb6641bc32
font_01_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13208 11104 bytes
SHA-256: 15a7dbc57fdb3b70925c3edbfe10c0c47caf9b160d8167bbd3e40f72e1a45a50

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