Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd913f6a5d40a18…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 00:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2acbeade06ddd3dbf968da48afcebd3 SHA-1: 4c902ea369a23380316c38b88ea17f01254488f7 SHA-256: 3bd913f6a5d40a185fd9b5a30f7b2691bc617c097d6c29951c0090b8e6e638ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains or compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://garglob.ru/uplcv?utm_term=main+game+mobile+legends+bang+bang PDF link annotation
    • https://ikansambel.com/contents/files/22673153817.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/zanapapiwufepikak.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/diwofazavu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/deruwusizogigunowunubuz.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/zibivonarar.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/rupopa.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/genizezedotanimusatowos.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140d286d3a59---95920681520.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/7034916339.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/88924473288.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/kiliw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9e78d34c28498dd0468487e94fbe1f04/tezuxikixuvudezixidej.pdfIn PDF document text
    • https://22importexport.com/eimages/file/misifavujewoku.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/kopowesomekas.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dca5cc5e80---supipiteromoforivogede.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/92265633245.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8a02f9b0b8e51f11c8d39ee9c0e5fd4a/6483364362.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/lajasupiwirobusowupifuje.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/tovameramif.pdfIn PDF document text
    • https://novsport.com/content/File/rakexomedulawavaf.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/95045208439.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/muminaduzozejorolixi.pdfIn PDF document text
    • https://gulamanis.com/contents/files/70549520675.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c6594bf9---28711762948.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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 10528 bytes
SHA-256: a4831d9311b6c89b54b2add5b474ac9b8cf3970d1020c401c11ae60a4fcc2ea5
font_02_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 16520 bytes
SHA-256: b727b1f74c6a96becacdc4d84f07749a51e49ed18ac3ff59ca1aea4ca2735f05

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