Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17da8e3c866665f…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 02:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adf0fc449f9a9ebedea5de04ae953aac SHA-1: 87a90d242e54476b27f53c499e7856aea6c4dd0d SHA-256: e17da8e3c866665f09e7fb03c88e8870bbb852512c420f782caa74ca85426d53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily obfuscated, indicates it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=dream+league+soccer+2020+download+android PDF link annotation
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/foxowimifa.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tujowaju.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/bijaxuvajajikutajota.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/86608297580.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/4954075149.pdfIn PDF document text
    • https://teamcode.net/upload/files/ronubexatofokonolozidi.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/tofujajesedajufezesuxowi.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jebogizoxojosig.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/76100412997.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/tovijevuvuxutikoduk.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/69632756241.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/76261146558.pdfIn PDF document text
    • http://dmkert.hu/files/file/91283767629.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/27549842183.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d93ea8b2d---xowuluzubopig.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pimesesowovuxijuja.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a6c936d0bc5a6431f8b007c89dd13070/79389977329.pdfIn PDF document text
    • http://umhouses.com/uploads/files/zefegobugoki.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/vedaremojamuzazamir.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/uk6r5g3nriubm5o9bhd5sphedn/wuwafudakesex.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/besiwejavozedi.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/6295458614.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13A 15948 bytes
SHA-256: 04fe8756738c2b957e9285256735444c8af266ddc91bf30761cc1dc81b1b4b8b
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 11044 bytes
SHA-256: e50739d9685867533544a77bcd18438a1c98fdfcdecc61945bd9929cdd9a540a