Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d29a9d5a053cb98…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 22:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59b349552e5ff8603be47ac1472096d5 SHA-1: 232f09e85e46833881e708b46c616784255fad03 SHA-256: 2d29a9d5a053cb98d9fafd0b01aaadf89592e7edd75ecb45a813d1b05011ee82
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, many of which are compromised WordPress sites or hosted on disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ubytovani-budejovice.cz/picture/vtextu/file/sebagexadez.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/07cb8e7a8a2625eb78d408973e976211/45298428579.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/jerabetozajamixi.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/2514632283.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/fifoboxalopakedod.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/50759931031.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/16349414351.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/54798587251.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e1fbc529---tubururifuvej.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/xuzonijenojesepare.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vilazopinurigiwoxi.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/98920768418.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/ludizaranaxawikusibijud.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/32728891491.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/6154289415.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4ea61584---jexegebamuvadaxurawi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb424f048e---zewiguparonixikafubepaxe.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mikijawasoxinonekifami.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/71846428491.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/95985435900.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/61795376659.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b06b5f7dd0cf8a6e63a806ae00fff45c/ludidora.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/88795003515.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/97ba0af6866bae2dcd49105821e34574/terinufuraso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ap+physics+2+formula+sheetPDF 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_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 10956 bytes
SHA-256: 64e0d0a7e2696993d600546a4d7f717a90ca08c79f056ee477d6348033f91a75
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 17432 bytes
SHA-256: 56491cfef0094123aa073bc1936ed1c03c2fe3a6af5b77a1d40dcace422c0f83
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1