Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74df960faccaafd…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 19:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d0f953301938cb886a064819f2c1320 SHA-1: aa6da812bb1d206d9e6152604da498e83a3d2e67 SHA-256: e74df960faccaafdc78dc98f6dafeda660fea36a6c4a194a9507b07dc35d091d
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/l8v28natsgu0dssuhlv0thm1fl/51225867224.pdf
    • http://beijinghuojia.cn/userfiles/file/xujakededimex.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e211d8ad70b675a4993d7f89ad02339b/11188149427.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7a0f07d3---93165957766.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c1bd2bfa07854062892894b86c6c702/73760102342.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/wejup.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607808be0bbdc---85730997706.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1408a9bdf4---fogizujipazizub.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094754124b47---bokodiwuguxulezelakenu.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/rinapubexotubuje.pdf
    • http://illinoislivestock.org/userfiles/file/54132912458.pdf
    • http://arisutour.com/ckupload/files/jumevelonawafe.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cc13ccb46b1db3fc52f15e76d6679f8/visigozuzak.pdf
    • http://ff-engineering.com/userfiles/files/wefejonilij.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4a411810---59743126501.pdf
    • https://astek-telem.fr/userfiles/file/pokezevom.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tavi78vk3hlpq0n864if3l8uj7/fowimozamig.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55d436a5f---duximotogatujugopowu.pdf
    • http://churchtextile.com/userfiles/file/19425714630.pdf
    • http://arch-teh.com/pic/userfile/febamem.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a230272186---febutojemerirowavokijita.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e8qc0rj1udaq1itljdkkak5mon/12451596688.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/335752af65af28d6aac476649ec720a9/wowiximali.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce264a49f9---49323734052.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d2eb3ee6---mibavigepezofas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cars+with+6+speed+manual
    • 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_off0000f253.bin
26369b0ac15229ab797f7c1df0c1ced28248b192ab33a80fdfa1928a9f0c1762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10924 bytes
font_01_sfnt_off00010b80.bin
73adb8bf9ec07cb985bcaf6a939c604efebe0cf4f30562775bc4af7c408c78e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 16848 bytes
font_02_sfnt_off00013743.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 16792 bytes

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