Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df5e5087772c076…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 07:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ab37c9db7166efda20d25d69b2502624 SHA-1: d83c70762b1ab6c58e5f5b466683348cc2d63b84 SHA-256: 9df5e5087772c076d6c8cb40666996db58b02a7fbae0a7cb33add6baf9e7c673
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of these links indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qj6e5ban0brs261lkegu86cup2/xabafexit.pdf In PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/18031281533.pdfIn PDF document text
    • http://sushi-belovo.ru/files/20396253380.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/58760150057.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/katilagibazekafuveguzu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092478cf0a52---pavijanologegasovemenuteg.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0acf0f9e---zujolu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fdfa0fbbd1753111b7f35982553eefad/latafobujalaf.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609857cbe2b11---53066880264.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c083f7bc011---87573031419.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/82342e8eb9f6a4f114b686bbaf2db3d8/42730644856.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c25d1a41---29430656513.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/21dcnc43grf6usbbc3r5uovndg/munemevekow.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/motufelila.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/zenimivevilesikuxuwutizo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/50795969650.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/64b5a4954ce450727947f3f3fa8a7e43/30543162578.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c705bfd0df0---39470835299.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77d5bfc60---niwedow.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/79689421d7c64df13255832606bfb74c/88893265003.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qb644f1fvl0k9qvt5dn48nrjih/xomirubidagawumobog.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/60842214116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=d+letter+with+crownPDF 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_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 10084 bytes
SHA-256: bb0ca12d6d6f9cb95a13ed853fd5444dab578fa0039bda7e7c817d3d255fd055
font_01_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 16904 bytes
SHA-256: 8fc2b1c71195b4185cc62dc3da08419d258da4b6e9f614a3ed336d175dcf7c5e
font_02_sfnt_off00014671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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