Malicious PDF — malware analysis report

Static analysis result for SHA-256 726c82a07ae9c12e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 04:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef554c498fecb1613d4a79b323de2a4 SHA-1: c59c6405dc43ac7d001e6d68da6d71b4b9c22662 SHA-256: 726c82a07ae9c12eb2b788fa4ed0044e9e8b0bd0da3a6ba2ec69f414c4cec62b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://etkenkalip.com/CodeignterProject/vizyon/files/bowenewadivibabotojur.pdf In PDF document text
    • http://ipllaser.in/uploads/vomiwifel.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/bokewojera.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/c7cd1166dada8e7242d335990fcfab22/mazubasifuwifobijojavum.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/kimamovusuxelig.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/j2fvlj9pa0ht2fq98vkqtk7qht/33571017846.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161064365144a4---86187486169.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/34594891313.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/29556765664.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/zomolo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d89749e08---37206829208.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc6a0391a---kelomafugopovup.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/divenerituf.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/59602059604.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/019c9dcf89d79a9f2cf39e031aca4988/nikoxetedugiwajasi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/rewidivonuzonadevupumin.pdfIn PDF document text
    • https://unitjaya.com/contents//files/64282139676.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/45187921156.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5c4a6834ccd3a68aefe3e0ecdd936a4f/13902023290.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c242469847a---dederabelomekibizeji.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/39800305530.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210725100110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=air+fryer+fried+green+tomatoes+recipePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 11012 bytes
SHA-256: 2c40c068e88c9746b46a71ea07a9365ffffc3a82d5d6755f526ccf6838d79413
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 17940 bytes
SHA-256: fe33f1a841ee8f10d7df3c1fdf12e4a33acc4b32366f0bfc6007739d728f2223

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