Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe751398dc5014f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 08:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8dd5906c5e2d8d842eba79bcaccd3bd SHA-1: 3e9f00d42f897513e8c9ee46c7ce5c68a5a0bb83 SHA-256: 0fe751398dc5014f0db59e48ac9f6c698bdb5f4d924a9467ea59825860b9e4b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=free+online+games+like+fall+guys PDF link annotation
    • http://cheapmarkt.com/userfiles/file/zefifakajesotapitubafev.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/nupaxepufevabobafojepo.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/fiwavezutediluf.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/lujasit.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lunopapad.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/24203767875.pdfIn PDF document text
    • http://chinazzjx.com/d/files/40742587182.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kapevejuv.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354da4486a6---17896952075.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/77986163561.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/45513331889.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/bezesuseb.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/75673798780.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/bufulevoxu.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/52754555409.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/69fcad9c3f8828b155ba143cb981e382/87632235924.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/bisudager.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gitul.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/25729611136.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3024e2c2135bdbba8fdb2bc50b81095e/fewonitorejixupivog.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/padatozufewakulemerus.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/71188919215.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/rugasorelapa.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vumilotewaxavafugorej.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/galinulobon.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_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 10740 bytes
SHA-256: 1ea1b05f01368e63a90df42394431d0f87941cb3ef534b4a1d0b25d34d54c580
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 17784 bytes
SHA-256: 96a062c75024cbd50a9922b058bc988512720fb07205ca327300b3a0fa348423

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