Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5197ef7b4cf3dbb…

MALICIOUS

PDF

89.5 KB Created: 2021-08-08 03:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 050b9e2ac213241fe0afd461f38935a1 SHA-1: 776462141429acd674e9775fbabb80e312ad3491 SHA-256: b5197ef7b4cf3dbbfcb5ebbc44ed14f1cc8fb5dc1f7702659297ad224e151899
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://huntic.ru/uplcv?utm_term=hollywood+full+movie+download+app PDF link annotation
    • http://mini-garden.ru/userfiles/file/lenez.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8da199f5---bezerufuwexoxerego.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q1h0408vu2oukg7jc5g7j1m4cd/22384827305.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/vomitinoj.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/97927646103.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2276a05092---24076354286.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160842a56217a0---98026714994.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/86512857447.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/89296738633.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef01eed7f---bufuseniz.pdfIn PDF document text
    • http://krzeptowski.pl/file/27727812057.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce7c5ac52---saxukawoseduka.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zixafurobugeb.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ncsv7i75nd44k0l8qbbbrrn9n6/21522261792.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c1e93966806a0b48c36ce83c3616c2c4/katedisokuvogigopunix.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210805_10802656D79A7B73.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160839440c9010---juvavujumobi.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/81078242528.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/wujek.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/jepeponasikowikuvama.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/foqveuntc18v730ii250bvpm85/52718424332.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/wozolulapilusazo.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/zigazod.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8c4b18846087bb5641ace204a79b8284/sanodizotekunolegirekono.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/94068916677.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/visozabunuvi.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_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 17032 bytes
SHA-256: de492dfbc04e3373bcaf1d230f94a9a739206fb16ad87d3585cd3d57eae276a2
font_01_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E43 10648 bytes
SHA-256: a9e755fcd6a4ebbd68410b6ba823271a1bdc42fb7ecfa4a33b42ca8000dbae90

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