Malicious PDF — malware analysis report

Static analysis result for SHA-256 64856f6a674f14dd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 02:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1025f33f01ac3cdd5c23377d71844a57 SHA-1: 9201c8715cd51f8198d8305aa6f02fb3e5d76295 SHA-256: 64856f6a674f14dd2f0d0adc2f88be1cbfec2c3594917ec499f24c8072f196a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

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=8th+grade+balancing+chemical+equations+worksheet PDF link annotation
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/05gu4vr7fd2lan80ghdigvi4ab/50747769203.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f3e68f7ea264e56c059c8a2af03fbbb8/89733894898.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/27212360470.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/linabofizarej.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e0d1e700ef1a047bf871d5f78d5c87a8/fidufuwir.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/49ef1297784b83ec8a7f6c3669f6c0bb/bawuzenejo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac961b0d9---76205697456.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210826134718.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/okjl78ocfp90jc1mkh06pe6agu/gobelutetamejexugosux.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/29860027447.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/d47d710f9097e4ab0b8999b973223590/lofujunutunuk.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/91918745165.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/36136426680.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/mefutekezakozadufote.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c137b2db454---1299582203.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/6983554089.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/jogujiboxorow.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/63957347783.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lebisezaf.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ea877db5e2f38ac538575eee15dc5ebd/37897541380.pdfIn PDF document text
    • http://candientuvibra.com/images/file/wumuzutomuduxa.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a700136b---guxilixigevotugilotaxunu.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/kifiralupokojibozedini.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n6t0kt5fce5fl4fj3fb00uvh8i/lisoxebabafovux.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108356c0da73---dogodijilinijito.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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 18216 bytes
SHA-256: 0b4d5963c8486dac5c673c2b3d287eac19eb8e3c3007e3bff800156f0026f375
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 11492 bytes
SHA-256: b53cdbdfeb560622f3f17a88fd68dd7290e5d21cb73199914e39ec1ae62e8fdb

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