Malicious PDF — malware analysis report

Static analysis result for SHA-256 b195e3783c7e4b4f…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 02:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e7c9920d657c65a85735fc66b34ea67 SHA-1: a121173e73b871991028cb5808749305d126a07b SHA-256: b195e3783c7e4b4fba4c6ab3b78943334e140613665d9a99200bde7707910e86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of an embedded JavaScript stream and numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, indicates an attempt to redirect the user to malicious content. The primary attack pattern appears to be a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ab00c941b---2826075706.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/afa8b56c74b2a0141d4def0a6c0bc45a/babufiw.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac9f1ee61---45334450577.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c8c02c56c---68118788800.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54eac7c12---91554690815.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3a735770fe48896d84c09ff39c3b8790/wuwarajiwawewamami.pdf
    • http://aweibel.com/Photo/file/rewativarodomosere.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k045aofosqif7bv729r6r095e4/kubevomibapixotimixu.pdf
    • https://aplusadvance.com/naver_editor/data/file/1001945704.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7ae2e74a---wosevefubenovano.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/a2j9g7lrtukg83ak8pihi077b5/66607196278.pdf
    • http://aivieksteslaivas.lv/userfiles/file/84782452997.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090d42e5a086---13742200540.pdf
    • http://garage-fuji.jp/js/upload/files/39137968850.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6q475eevo1tftf9br11lc80s71/36345088117.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/712e8775f9da2f4d67dde1cda4e95415/zabuzuberifoxemi.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/41129946795.pdf
    • http://gildiamasterov.ru/userfiles/file/gufakadilu.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608506105c962---bijodiregokogokovokenur.pdf
    • https://eyetracking.pl/userfiles/file/30535199757.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/zalozumopazoxonomurazaxoz.pdf
    • http://alnoorcity.com/userfiles/file/95424833322.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/31a99b38237a7ba350c9b65b870a088f/watunobubodizuroxu.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c2d864663d70ea6d51aabf79c1327e50/31950327683.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44166e025---34308871549.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05bda22a03---nonarupat.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tt0ovbs97rmpgobslgt46nn6tb/90796615122.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hypothesis+meaning+in+marathi
    • 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_off0000fc74.bin
6a25b8cde849d11a02ffc4d6bace9f392e681ecfd01382e8dbd3d87e52c4bd09
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 10760 bytes
font_01_sfnt_off00011505.bin
98d1b8b1c754fd704a7db5a12aeb8bea00400a032c2bae7ca61c914d20059e31
pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 18844 bytes
font_02_sfnt_off00014684.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14684 16792 bytes