Malicious PDF — malware analysis report

Static analysis result for SHA-256 09743082921c7e48…

MALICIOUS

PDF

69.3 KB Created: 2021-10-20 05:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00f36d8c898770ce217cb0e318d70d07 SHA-1: ec6b084b2e1d1f84fa0f7032c51d0bbe885bf2bb SHA-256: 09743082921c7e48b6393780fe32a60f70784dc53677918fa290e1ef7fe1f9b7
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with a 'Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are hosted on compromised WordPress upload directories. This suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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
  • 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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161636d8d76270---39240373420.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/10783877061.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb717039d9---4363763829.pdf
    • https://agermag.ro/mm/file/69969969702.pdf
    • https://ferest.ro/imagini_ws/lujanilutajevo.pdf
    • https://batdongsandothanh.vn/luutru/files/46169647154.pdf
    • http://lumieye.com/userData/ebizro_board/file/72256790681.pdf
    • https://karolinanowak.com/userfiles/file/lanusafabodawexuge.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/femuwefepixekimujato.pdf
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/51628258141.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/36920484743.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/df3593b84db905e651e231f0e146439a/92496463608.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/61561173817.pdf
    • http://evrokomplekt.ru/userfiles/file/79284668200.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/gonimubafokiwaj.pdf
    • http://ayhancevik.com/images_upload/files/52317440001.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8eec640a910f1b41e1432f8ead1a73bb/batefawifofafepode.pdf
    • http://trustarshida.co/cache/fck_files/file/33080561822.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/98662128573.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/39794810929.pdf
    • http://marcth.pl/media/fck/file/30456429018.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/zegosoxelagi.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615963010a24c---83802934140.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=how+to+write+a+screenplay+in+google+docs
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd16.bin
6a2a8749048c43fda82c23bca705c4ec284957558c9f1928458fe009b91c422e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 10880 bytes
font_01_sfnt_off0000f634.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16792 bytes