Malicious PDF — malware analysis report

Static analysis result for SHA-256 400aeca12859e217…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 03:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a64c03c963ed6b682a2283ecf97ed46b SHA-1: 2d3bdab7508c91f55f77f34cada5379422d0f0e3 SHA-256: 400aeca12859e217bbea0d506ff69eb8d2a10c44e82aca9f2e5e70858756ebd1
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=swift+enum+from+string
    • http://gocreate.termall.pl/upload/fck/file/26143556576.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/gawozapa.pdf
    • http://polyalpan.hu/_user/file/13114683.pdf
    • http://sacoorhealth.pt/site/upload/file/garalepesowulubitenadilut.pdf
    • http://alnoorcity.com/userfiles/file/kudilolakavisezap.pdf
    • http://www.ecvbrass.ch/user/web/file/zulidef.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e6662a77---24915535816.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/29a34f2d043ef4d33dd3011a70ec510d/xarufasekosusedogiguguviv.pdf
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/24805086506.pdf
    • https://gyandeepjkss.org/userfiles/file/fabotedupiforedelebem.pdf
    • http://fly.no1-yes.com/userfiles/file/bujobepivawes.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/30tgsaprk6j0bprbvpp4njglac/69856075857.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06fbcdefcc---73338604875.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd955d02d---parajut.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3150d0457d54a64a2807847d30cdd90b/47663538934.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ce393cbeafa2baf65e9057091785017/76845268274.pdf
    • https://esprimagroup.com/userfiles/file/rumadexamav.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0pimka2g8ft1efltgp3rbfe70n/67712751761.pdf
    • http://bhs1966maui.com/clients/64750/File/64895824636.pdf
    • https://alamansyria.com/userfiles/file/74522087361.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8303e4818---84552918206.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824e7277f18---42043623374.pdf
    • http://midel.me/userfiles/file/15898462441.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd13d759c3---xataretiwukiwanal.pdf
    • 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://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_off0000e6eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16792 bytes
font_01_sfnt_off0000ff02.bin
56653cb1e0cf0c90fd1dcc9da70a08067f14815639f917174ad4d14043f795c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 10608 bytes
font_02_sfnt_off00011749.bin
b2a149686ddccb572528d4ba1ae1dc66fec2efda87fcdded98a6d1a3464dc480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 17416 bytes

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