Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb50469d7e09ad6…

MALICIOUS

PDF

93.3 KB Created: 2021-06-27 00:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3904f08f8d80ff5fa0216aa54a3e701a SHA-1: 96d81c2d754690b4c5597b777e7427f3f51fcf36 SHA-256: 6bb50469d7e09ad649d032afbe2eca84d02064b83fd6b09d0b4746b160eba58e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kaushalacademy.org/ckfinder/userfiles/files/redifodazuwe.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d70cb4e4---50040715453.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3b0c1b2452ef4d6e88d44ac37f108055/77206890457.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/37291542041.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084afe1cb2bc---zixewogiwosiwenatulogo.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1he44j837vvcej4rn3gh6co3n2/9829037202.pdf
    • http://faurerom.com/userfiles/file/67206746706.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qgkaffih1ka28h29ia5u1drtp5/13582758738.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80530a5fa---96016808085.pdf
    • http://flygarfield.net/userfiles/file/fawibafuboxalejimizunoz.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/39640265253.pdf
    • http://amuseonline.com/absite/userfiles/file/70234746794.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5787b3297---85122276024.pdf
    • http://18554080.com/userfiles/file/liwumizedelewunibu.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077166d29b9b---nawubapegidawuvobinufo.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a09ce38e---divipisazavupezaxi.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6ec92fb23331cabe8150818d4ae93108/silusadexosesufakak.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/6974034093.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f088f076---lazekufuna.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gepcfjopstq8n1ehla0fml232g/85462188592.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb5b0fa1e---rasegameda.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a044315af85ea856c2d2225e289593e7/weguwepomiwavuxuferefi.pdf
    • https://udruga-invalida.hr/files/bedenonenuvufuvunomi.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/bdd2ab5b4c9435928b87432b3c866dca/31392943061.pdf
    • http://gleneaglehoa.org/images/file/vegemupoxexudosugobu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=brother+7840w+user+manual
    • 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_off000106e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16792 bytes
font_01_sfnt_off00011ef4.bin
5c888a8a5c9b2db5e3f7de44acdf63cf4cde1b94ce1d59a36f483b40303e41cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 17612 bytes
font_02_sfnt_off00014cff.bin
4c0cd34c6dc8f431ebbd96630c07063bdcb223276543b6929737a863edeba54c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFF 10976 bytes