Malicious PDF — malware analysis report

Static analysis result for SHA-256 437f45b26fa4b852…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 13:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adcbc46a1a2b0d6969e70eb9b61eb022 SHA-1: a536b8cde959094dbf9d79548027fab8f84ecb09 SHA-256: 437f45b26fa4b85258416dba145d0b8810c2d3d65d87971c28d6cb6303679d90
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure suggests it's designed to lure users into clicking links hosted on potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8501b4c6f---soritorurivurasar.pdf
    • http://zaun-produzent.de/userfiles/file/tetifonazujubotomoxineve.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b564cea0e---legexojiroz.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/dccd90a33af7f38b05c10da12d5633a2/luwudek.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/02130c19fdbc3c6fec6e48bad368404e/nugobimepujofi.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a9325761---81235779125.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b81acbf79b008242071a272a4384b54e/lutijowusutefipivom.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214f7a8ea5---vuzowodabilorisesuxupopuw.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9515137f---nujuxuwixusovo.pdf
    • http://infinijewelry.com/userfiles/file/64378223002.pdf
    • http://kamnitikamini.si/upload/files/vuguxexekabutipijuzajul.pdf
    • https://autoprofi.ua/userfiles/file/taparerezuwigurakuteb.pdf
    • http://www.cbs-emballages.com/upload/file/13597307862.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/85221645487.pdf
    • https://stef-nancy.fr/upload/document/75398599291.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2da9dba9a7---4717982810.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e1ee70bd---nupaduxog.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/70978274564.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc725b00fb---18595050142.pdf
    • http://kapli74.ru/upload_picture/nilixemer.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf75e2ebffc0c4ae559655b7a2a74fc6/50415292466.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/sl1e51o6ejl6s9hg11chfiqjjr/97718285664.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35b4f0c661f6d89129da760e2d48498a/6949528290.pdf
    • http://3xlove.com/uploadfile/file/sofepajasoxab.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bcf28668b70d047264232f4458ef02b4/futedivatojisixofotovoxa.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a70b8e3a54bafed4b3e26ce26c0cb269/50755044277.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db236a19---nopotimajed.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=heart+shaped+philodendron+yellow+leaves
    • 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_off0000edaa.bin
01e8df32c566326e6977c57fb54d4f1f1d58d0ea708252170c654bcb6eb9ad96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10748 bytes
font_01_sfnt_off00010652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 16792 bytes
font_02_sfnt_off00011e64.bin
981ec0189a654f8e5615c6218cff5c259f1c0eb965018d5032a4f9a0d6038fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 16576 bytes

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