Malicious PDF — malware analysis report

Static analysis result for SHA-256 800ae83a4f93a3aa…

MALICIOUS

PDF

74.8 KB Created: 2021-05-07 07:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00314bde569d669eb7e3f590c29d8b33 SHA-1: 3687790e51a9ea9697a9d68c6b7c773b5ef931b1 SHA-256: 800ae83a4f93a3aa779f3e8a6fe2b0d521a8611ec67694c432c91cc8da85c483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160784881d732d---wadorominapij.pdf
    • https://tavio.ru/files/file/31745496352.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/pawasenebizojesolikuke.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6800ebc74---6330814770.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l93vhl2d96qceca2sh5h2tek0u/28071488109.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940cb0d95c9---xuxexog.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5078e9a7---58633483874.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a198bceed---75571832657.pdf
    • https://activepymes.com/pub/file/vuxozoke.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607364abf404d---73919559958.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/08bff15672c91a5017d41f00b957c539/84892914025.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f846a0fb---xepitirapu.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce58a36513---63320964804.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=shipt+application+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce12.bin
c6ebc87e18d8b64357abb8425f6b87a49091cae4084d77190927627249945477		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 5484 bytes
font_01_sfnt_off0000e0bc.bin
0fb019067f91b6715045e064db08f8e1f7608150dccc2bf878656020b138cbcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 11064 bytes
font_02_sfnt_off000106c3.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 16312 bytes

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