Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb84c6b431654d1a…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 00:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c1c365ed7b7d012092746b1412c616f9 SHA-1: ac5ac9b233b5ab67545f9e34888f2eb830be0ceb SHA-256: bb84c6b431654d1ab6ed2fd5dd009bdb5364ac00308ff92aa7eae8508cdd981b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://arcdesantmarti.com/biocop/Images/images-editor/file/89975787712.pdf In PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/44105539922.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/50280231121.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ea67182bb5163e5ba24c3f364716f2f7/74901165910.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/44794286303.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/pusukadebafexafi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add9df23435---vonuripowawafiwuxukina.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0pkm5051bmfbs887hoaol52ar7/16974329892.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/3414233566.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4025da123---natubezosibuvofi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1e7dfbb8889385a79d036359fc7610c9/muzimadunotepodunuseminuj.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed2d0e6b4---9443568803.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b3d4f2b91e00f088d8943a16af7a7ca5/8460182724.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ddf03f9e3fb4a071e2f4dbb882f00bf0/mifamupugedafix.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/xajif.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/62909265630.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/34687486785.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cb3d2e47f72ad1557cd4e5a96b029a38/jidubekafokebulux.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jhdpethkg2d8a6uc4voe9lr2e5/majatowalugi.pdfIn PDF document text
    • http://jngf.cn/files/file/benosepusafodef.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dd6b0feb---88505808690.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/dasuwikojekafozadaxam.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9rv9alna14965k9dgb9gjr21b/sitawukopedugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=quick+hikes+near+seattlePDF 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_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10456 bytes
SHA-256: 1206247cd55d3c4bd2b079fef00afddc4f0aa6e6bf5fa10819cee1d9de95c2f5
font_01_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16556 bytes
SHA-256: b0b800e7da982009d67aebe8ca2d15fbe74840daf597f5552f683b7545de8b19
font_02_sfnt_off000147b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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