Malicious PDF — malware analysis report

Static analysis result for SHA-256 797b4922de992120…

MALICIOUS

PDF

74.1 KB Created: 2021-07-04 02:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f660c55ebe8de6cf0557624d3c4be02b SHA-1: f68e43693c8692c11dee708d57290c099a2194e0 SHA-256: 797b4922de99212013d179dbc7852842067e1a0b2a6ca0321a2089962a979999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable hosting and compromised CMS platforms to host link farms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef27e8d174---gebisusuzekoxab.pdf
    • http://sieuthicayxanh.vn/webroot/img/files/texaj.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/90762816407.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/felapebefakifobubix.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4997c57963---70402669554.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35bc8e675d---10121044486.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ffd498ed28002846fa8a7b39f6c610d2/pamajirefefitejiw.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/enpumbfif1op4l87dc928lajl3/19519797241.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/37292882162.pdf
    • https://likeevent.it/writable/public/userfiles/file/dosobizabamuwiwojo.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/39ok4gu1cj6jk2rjui9sh3mtug/34343550276.pdf
    • http://china-zub.ru/userfiles/file/13660417439.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/11093170134.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/68d884d7f0d35830def0b9a2eefa6dab/tagawevodekowosa.pdf
    • http://0930actress.com/files/files/17362332745.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608a176039b88---88025911615.pdf
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/25290715137.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997aa8a540a---xutowowufiv.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f36d63b63---2772324777.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b9f089c83---65677190093.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c6546a2a0801a12211b0d132a4f0e860/vedosifodurofu.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8971c1921a---50358159518.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160857aea1a2cc---xiraseneb.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/51967232885.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/caa4951b7612653084598e4f71a71632/penuroledupo.pdf
    • http://webinside.pl/userfiles/file/1175198399.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sisters+of+st+peter+claver
    • 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_off0000bf1e.bin
c8fe29e8660013d0974b08d9c703934038a4fbe5079152a70c8ff4fe35d1de33
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 10508 bytes
font_01_sfnt_off0000d732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16792 bytes
font_02_sfnt_off0000ef44.bin
5b0c0df8107a1ffa15fa783a9501844517fae1e6750d458dc4b098fd90a8047e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 16392 bytes