Malicious PDF — malware analysis report

Static analysis result for SHA-256 911f854339014392…

MALICIOUS

PDF

89.7 KB Created: 2021-08-12 09:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 350bc5fa3cee6fce2f9884061c3581bd SHA-1: b7e2d6e43f4fc9f2e50cd841971d5a843fe02691 SHA-256: 911f854339014392938cf370ea831276ebf43624c0f9e46303211da7beb8ce78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Multiple heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eaed63d0---regaxarixa.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c0fbac518091b56b8103c82686111bc6/giwewoni.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/31524592135.pdf
    • http://ji-tien.com/userfiles/file/mumamebupemim.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c93de4fdd---mugepafolurijogexuzavigo.pdf
    • http://royalgroup.at/tmp/dabibefebijaludafude.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/mejewarexuregabolaxumipuk.pdf
    • http://ecole.ru/text/images/file/41198953772.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609877438b5b1---medadosumarimaneresere.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160961281cf9dc---jotewunesowinus.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce5cdc948f---7784598268.pdf
    • http://thuduchouse.vn/pics/file/tevebanuborixam.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c1c55c8073023238ec4056ad043c466e/2811057336.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/jawiguxasegixoxudubi.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ik27cr4fdvn762qtl9ak3ph574/zibabu.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q1sejm9217tjalmiie75b5ur80/saboma.pdf
    • https://clubslotalmatriche.com/calcas/file/32735345287.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc00ea88fb---wipogunetotalobesetumow.pdf
    • http://architects-desk.com/uploadsfile/nanezetofamijepininotizag.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ab3742d0---babojuvatapi.pdf
    • http://mini-garden.ru/userfiles/file/91276680357.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/et6d8164urjb1d4lr3tvd5d3v0/98788593014.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/90005225143.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4205a8a41438ccbd2dd07c61608a9df5/mugisogusonorabajed.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e25462fce565ea2a6f849b64c9142aa6/jojasorav.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/523875da9daafac61481604bf7c51e86/negapaka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=classical+dynamics+of+particles+and+systems+solutions+manual+pdf
    • 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_off0000e95e.bin
1bddca835bf35c0abe2b386bcba0a2d74c21cf768c7ea929ed690d925796ce15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 18252 bytes
font_01_sfnt_off00011a11.bin
46a7f0406ce3f5ca4d99df1f1de6210ba8459a885776d1d94dc3c23d9c40a1da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 11024 bytes
font_02_sfnt_off00013385.bin
7a20f55456e96d8dc46895b9fceb491285db744b59f33aa823d9adf72e61a80e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13385 1840 bytes
font_03_sfnt_off00013ce4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 16792 bytes