Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cce22f02a39361…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 08:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2192452fde55dd847c64f51511bb33c0 SHA-1: 8c419a57550a3d5ca9e7cfd6b436383811f1a983 SHA-256: 36cce22f02a393612dae131021cf7de9b1681b55de6dcb4486c822add2400adb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979bc1e4587---25176120527.pdf
    • http://sattamatkapatti.com/userfiles/file/65431063242.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c398b0c75ab2a93b4c067ca4a89f4f50/20578132342.pdf
    • http://gediklimakinahidrolik.com/resimler/files/xuxep.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/98caf6d9c10fade0dd1cd80355b07362/kezinitun.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87af0bb2d---nupipemukaxazuvop.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21966a758a---jexojiwi.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210612_210901.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084a43ee6820---nufitu.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3d261c492a340c2bd429c8dd1073ac83/24554078195.pdf
    • https://ktmcollege.org/public_html/userfiles/file/vokaguruxajurewaje.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f52587323---pigidoxowarujojemigip.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2b4a8842515bc54b3a16fc58a7b74b6f/64168897575.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609797af9501d---56945402860.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee8d5e396---bokowibovo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766e1b405d7---rivisexiwazuxabixo.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/257b096e9ac35bcf438c37d58295f94d/96557462041.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0ie298e8cndcfj9m0e6lfcue9s/tezevezulesotesepapasalir.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/65de778aef45794c7b60e331b7191763/61227497482.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0512683cde---jiras.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/260ab35bb0a1bc02d70d319a6a3b8ed0/74413818339.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0464d0794b6bd115d06a4287f8de662e/jogez.pdf
    • https://angkagenap.com/contents//files/32510286684.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160892667d5c6b---wivug.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8448ead7fa---podekisoxagajira.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bfoig04ajgpu62i6llfje8clk6/fifanimukinanoxula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=excel+to+access+import
    • 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_off0000f636.bin
e64c27e6bff1fc9669f86c6b1469b8f575b7eb5521b28f48f25765add3281137
pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10516 bytes
font_01_sfnt_off00010e31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 16792 bytes
font_02_sfnt_off00012643.bin
e40f9918781832879000ecad3c9e084e355666224c5293417c1bf871f13a1067
pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 17020 bytes