Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f997dabb662e9d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 23:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf0bbb1f838b5f2a5352643909ce91c4 SHA-1: 18465f22dca13f47611a4bc2b0c934171435314c SHA-256: 92f997dabb662e9dd1dbe7ced21758a5089aa043b20be1d17cf1e94c611d16c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c680bc745d6---17808411846.pdf In PDF document text
    • http://cyuanmei.com/userfiles/file/87450118468.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/pidogi.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/76305640246.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/12266862325.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c66dd13201a---vuduboka.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b4fe18dd---busegivunuzad.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/difirobofafal.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/65c85449cf64ca92ae5a57d9787be634/57978106017.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/cm5icvq47n5rd8dhr57odavk43/60999859989.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/28101296819.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/bijasoviwegoxopitap.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/293fabb8b296c77e49099928d0d52ef4/70100105013.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/uipqn165gu6f6j39l0j2b99l7u/61773343261.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/39139174396.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5d3dd14d---xijodetabalowonid.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a037eb3a9aa---38207227334.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/kinopino.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/lukiritofe.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/75007838972.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/jepulisob.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/21024446480.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ec9fc47a9ad2d4c8bc6a1115b6c0132f/45260634282.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/702055a031269090df0481a4d7090652/7163774941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+physical+education+pdfPDF 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_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 11004 bytes
SHA-256: 03449833ecf193ccc5c332e8d14b160702c1698993f5b48402bec5851458f981
font_01_sfnt_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 16996 bytes
SHA-256: 79cba77f7d6572902a71b01d7746260d922782b6593b0e1eb7ed7598039a5004
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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