Malicious PDF — malware analysis report

Static analysis result for SHA-256 0babf68cb7717e2d…

MALICIOUS

PDF

94.2 KB Created: 2021-07-24 22:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1a569c7e98dd38232cc65201ff5cbc5 SHA-1: f4eb33d5857352b51e7ec4623f3eac9015aebf5d SHA-256: 0babf68cb7717e2d2597dcb45c4ae5f6f93373e27d5d20a15b818ebce20a3ac6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

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 https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/07027ce6cbed64dcdad281a2369da96b/25214694044.pdf In PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/12793700089.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dffb32964c2---kilorexibiw.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/kidulovedipo.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qp3haiq7g9qv335gl3l332thca/bisonuduzukodovalima.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4ma9uk9utevv2l1lknna1hmp56/junudarub.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/suzivavojulotiwafofipe.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7opsvtm9u43l2sj5m3n3r38te7/rigokugelolekov.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/milimafidofugezej.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9d8kuq65jd7nlbd50ne7p00r8l/gusuwetupejexemafizavo.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/21763826856.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f0aa3e4bc---77149604843.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c6ab20d72---5191335094.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3be5d5dc---92281333443.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/76470294712.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1kbdo8u42skb4o7dgs7o4mna63/nevitewoletojesovikit.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/pibagun.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608100ed87f60---zajonerub.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6lh8d9lsc3gvht298im6nq15tu/6172519042.pdfIn PDF document text
    • https://samowar.ch/upload/file/lavago.pdfIn PDF document text
    • https://ka-base.no/images_content/file/48810970631.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/73122883088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=que+esperar+cuando+se+esta+esperando+pelicula+onlinePDF 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_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10668 bytes
SHA-256: 4827bff89c85a21fbd898d0a36008d4d19de0ec56aa0511297035f03b33c32e1
font_02_sfnt_off00013acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACC 17940 bytes
SHA-256: 72725f0b38a50d7db32a80db786b0adcdf9fde0fafd3396c596060984e2fc0b8

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