Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b08a1cbf1d51dd3…

MALICIOUS

PDF

95.7 KB Created: 2021-08-17 18:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b7159bbd61a91e1bee5683332628321 SHA-1: 8a7509464a6eeea5ce85f008b085090098191e6b SHA-256: 3b08a1cbf1d51dd3cac4a55ce2ba6043bef35d88fbd5f95dcf3ce49bbfa5d595
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting further PDF files. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af966c4e942---dozuzebe.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/via8ug6nrd17d96ree0d57op3u/dijitaguwuruj.pdf
    • http://hzdshg.com/images/upload/File/dubizibinizevibelimisowej.pdf
    • https://tylbm.com/Upload/ckeditor/files/86587912.pdf
    • http://beveragesgs.com/userfiles/file/gugevamekaxi.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2ff6e4e4---zikujefijuxopijo.pdf
    • https://aventura-agence.lu/userfiles/files/sagijabavuboboxuju.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5a8c530b9f47df1830209b28434d3bad/fewevevubuxawerijazizena.pdf
    • http://htygroup.com/upload/files/71093611632.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8d7c19e7939d4306ae32be592b896e09/9817234433.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/p9n8cqadkv5hsum8dfh5mro7ui/gupigego.pdf
    • http://sxhk365.com/uploads/file///31179295684.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0e1c07028caeb061ce415d772daab9d5/98796103257.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/db8187106cb72fa0c7316be37e064704/nuzisudenumejaja.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de13c964de---tazeruraturejipenevosuvos.pdf
    • https://safrano.pl/userfiles/file/46234105690.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/t3d894t8sjt8k4ogtr22q3qfng/tonimaxilevemoxazelunevil.pdf
    • http://s-moonlight.com/CKEdit/upload/files/xiburesasatapital.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/m82a5tg0blcvhhojqfrrfflod8/50794735908.pdf
    • http://kaies.net/upfiles/file/37923666370.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b66e0351ff5---gusoxubunosewagekuna.pdf
    • http://interel-rus.ru/test/sites/default/files/file/61988638018.pdf
    • https://digireg.cz/upload/ginexaxuza.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/loworusazivevavalalewawul.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/fabofoxagugofenal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=expanding+sentences+worksheets+3rd+grade
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95e.bin
f7fd124984b6294e49a8aa1e577261c3e5900f7f56c310e433103c1d03ee7cb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 11184 bytes
font_01_sfnt_off0001135e.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16092 bytes
font_02_sfnt_off000128a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A3 16792 bytes
font_03_sfnt_off000140b5.bin
00d5b6359ed2b977e8f06e6b6cea985b42d5b61ecc2542a0cf71478267b24511
pdf-font-stream PDF embedded font (sfnt) at offset 0x140B5 17456 bytes