Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fec57e3b21d694…

MALICIOUS

PDF

107.3 KB Created: 2021-06-27 20:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: debb7da304ffc945a921f91f70062877 SHA-1: eca26bbb87f521080d89816c7b2ccbb3763f6705 SHA-256: c7fec57e3b21d6942018f3b591e4b655be49df3363a5893c1d956aa3595194c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings point to a common tactic of using compromised websites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://philabc.ru/uplcv?utm_term=lil+baby+my+turn+deluxe+album+download PDF link annotation
    • https://nepalimodelagency.com/userfiles/file/kanogubafod.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/09d46915da77b9606a6d846b8b0b8d9f/55117738408.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ok67sq17rip2rdc435fdqpas6l/94463064137.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4e3b7171323092848d41f4790e1ff39c/suxekebezutikonusuzidaw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/55783e988fe701e38c8826755292b57f/76331011498.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb6f2eb7f---91259454505.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/32626782396.pdfIn PDF document text
    • http://ahchala.com/img/file/11181524546.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/kba4cnkr5inmqmu593t4q18bsc/30818821857.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/cd2d76157308be2c30db397ce38f1ec1/xudaguzuvebuxebigujesoji.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/tefikijuxefanemexoviwev.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/eslh0j2s32vp1q3j8itrig5kp6/simisopexamitetako.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rqvs4q23lc640d33ufju2b6hlo/sodonuduvimafumabululev.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01a74be79---junonekizarivisogo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160712abb72bdc---53535785288.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mlon2jrv3c6lordo111634sj7o/35463594693.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/72183787536.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/89354871571.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/jimiligolovekufusek.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f175eb7117---fabadotil.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f77b721915cb973a0b8e37a6364ba221/11059333185.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 16436 bytes
SHA-256: 2aa4d1d173b6612e2c4da7025f9c2370b0c110ce5e88cee009b5ec3f8fd4a324
font_02_sfnt_off000153bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BF 19476 bytes
SHA-256: c8cae13c4c34c5ab5faa8408bbaedbe08f1d2c63cad2a647f477184533a7723c
font_03_sfnt_off000186f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F6 10740 bytes
SHA-256: 6eb1548ec34d3a80edfb2eac98777accdb15ce99a276b0bfd1e3e510a61323f8

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