Malicious PDF — malware analysis report

Static analysis result for SHA-256 791b8086a691bcfe…

MALICIOUS

PDF

99.1 KB Created: 2021-07-10 14:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a6baf4356d2d226c1ed27bbc8e017dc SHA-1: e7463128a8261d339729f806109083fbb1b21405 SHA-256: 791b8086a691bcfe794cb73257d00547dbcc764b8897815cfde3861e7e5987f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the heuristic firings indicate the PDF's structure is designed to host and promote malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ccab3183d8b3f0cdbc1e2c23a9f65cf3/zemininuwifesofekiz.pdf
    • https://fivetc.vn/uploads/files/87916521948.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d910b72ec515f5ae5cf5849cf401d760/71959109439.pdf
    • http://adamlegal.com/userfiles/file/81821097926.pdf
    • https://heatingboiler.ca/fck_upload/file/databifaxesesixu.pdf
    • http://hesexpo.com/img/editor/image/file/2291909766.pdf
    • https://aldurra.ly/images-editeur/img/file/zudapa.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4457a830731d93282beabb311475f017/61344724086.pdf
    • https://biovuspharma.net/userfiles/files/jamezisemupunupaz.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2004ac29---vilaxiji.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a5fd0e8f837dca7d24cea6825e5cd3a7/sebitosoroxigipagedo.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/75nguj7vt99c2r72hkuvdt5f45/53856660861.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7bc970b3---22635757540.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9737ab73c0e4dd46c52f0e6dc3892b6a/xususefavirizalagudag.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/tojol.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/1791795756.pdf
    • http://cloverpark1959.com/clients/51168/File/72517143904.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c525bfd9074fcd0baea800beccb88526/zotutidetujovinupazujizis.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/57c02bca1976346e2db25b6ea001bdb1/biduzoxoxi.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1b716a7d3f89fdbaaf7cdd2d683112aa/tisugena.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083b635c6d7e---35873489273.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/lokrc5ihuars88jc3pipsgsaf3/rerarogolo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd0c64acf---37740999593.pdf
    • http://mppscstudy.com/admin/usercontent/file/kununorazomo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836a2dbfa24---mogunogoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=foundations+of+microbiology+8th+edition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e54.bin
f4036e2af974505854d462769afffc211e4afe63099ed98fdd3f8b09e67e208f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 17288 bytes
font_01_sfnt_off00014bb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB1 16792 bytes
font_02_sfnt_off000163c8.bin
b3c700389788aef95ab356dedf4848924dc258dab27cd4decd09bed28439b6de
pdf-font-stream PDF embedded font (sfnt) at offset 0x163C8 11604 bytes