Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5e16c0c1fd3f66…

MALICIOUS

PDF

76.3 KB Created: 2021-05-29 13:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfd21d36f1463fdf51948bf30b66adf8 SHA-1: ebf57d85ae06f2e8e24cf2385a4431179a9481cf SHA-256: 0a5e16c0c1fd3f66cc7cd7511fb64c87e793b923580f83032ee20fea017309fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to compromised WordPress upload directories and disposable hosting sites. The document body, though heavily obfuscated, suggests a lure related to Catholic Church documents, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://humanitool.ru/userfiles/file/43457588977.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ce44f76e---96732509782.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4b5d075e---jazusudedun.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/fdin556pfe94r72salh945hc9u/vevizizisuxipa.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774c632dcc8---gerefowoguji.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5c8d59f9---jewujosalagisana.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0afe33015da4c726b49a6d5d62e84b6/nesafariwobabazev.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/117e041dceb6537d81f81bcc773d032a/75286767891.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375d42c7ea---64033429596.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/92bc5e3fa0caf2741ddaa46c3717d724/gimarufajobudumugabige.pdf
    • http://mwflower.com/upimagesfile/%5C/73483479467.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mch4uni8ctfi6iqg386a3i0eaa/mulafuvipagejanigifugum.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mujobufumobemiwofaxiwof.pdf
    • https://circolodelpistone.ch/userfiles/file/xosemupijedipod.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1928420b---67079753590.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=documentos+del+magisterio+de+la+iglesia+catolica+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa72.bin
94e1b82ea9003ac8deca72614ba3fad6089047d50ab308e0dd1883d1165e91b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5476 bytes
font_01_sfnt_off00010cfd.bin
cf7c10ee443785e1e6a05ac1ba7c11a74033693e34600f31b3f8cd227b87f020		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 11292 bytes

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