Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b294499ac4f05c1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 11:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e6bf462c173baadbdd3df821e9de4f1 SHA-1: b6a313270c01d32541c95ca10c6092d080932445 SHA-256: 7b294499ac4f05c1e7a2d4abb99b9dbdd3a6e4f295b5043f675e71622184c527
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous links, several of which point to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/87683319b669fc19793332ee59218b39/7131429109.pdf In PDF document text
    • http://biomax.shop/filespath/files/20210803130158.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086639711279---zeveg.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/pajogelomotuzikare.pdfIn PDF document text
    • http://abwrva.com/uploads/files/82093184746.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5c2da4ba659c0652431bb96d5e0ca9f0/75474067372.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/suwurafokif.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/84697117292.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/mowarijuze.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/fusubonizawunokil.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/laluzur.pdfIn PDF document text
    • http://islandpointfl.com/userimages/28301211877.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/renarexogopekaginonovetud.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0957e07e62ebf2548e02e04ec94f0ebb/mugixur.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/kuzipufegusikopel.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///paromevisitirilek.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/wewasukidoxixatam.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/pisegekusuxupuzevolal.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbac67e0---12822942676.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c571e586d---22307064079.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0865e438---40627910553.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/zelexunegoxosoduwuz.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/gixezititologobuwapiliv.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumafilixovozewapari.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/xalaf.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/63897845575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=purpose+of+business+letter+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_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 10572 bytes
SHA-256: 55152cfdc77ef8e937d3d1a7a34006ecece1cf5fef988e48b822f463aa723255
font_01_sfnt_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 16220 bytes
SHA-256: f0caefd84e5d2b56363c3c4eb01a5274ec9c53fa540ea06a8d7c4746793ebb1a
font_02_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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