Malicious PDF — malware analysis report

Static analysis result for SHA-256 554033e290faa1e5…

MALICIOUS

PDF

83.9 KB Created: 2021-06-25 20:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d3d4317ea18299e5991065831edcbfc SHA-1: 227cf42ba1f8569bbab2fe4a8f0eb94e1b27465d SHA-256: 554033e290faa1e52b51c15a94e8f4cd310a04c00460e91f12f8e0db8e30d44e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/65103611141.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/568032071a2ad34d6d42b9d8e4cccb57/15203631177.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7295be244d---tofemefudodirigiwe.pdf
    • http://alpha-th.com/userfiles/file/22604627446.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081020e8c162---21028828129.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3b430be6885a50077664afa9d11922fd/15915576786.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c990c0a946b---kimomev.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9f07cba6---85095087512.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3eb853582---16935683813.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/verabiloxibajejopuw.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fdd2521b---54707081975.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/df15eeb7db26e9aa5755dafa83c0f3b1/rabepeba.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4306eb97b6964a1f3affcca428976721/rofetudifaki.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab5f7efc5---vizofediwunefid.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/057i4lsa2j7ukc5ijkcliedl81/45400657472.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070109733bca---wizivoguv.pdf
    • https://burlingame.com/wysiwygfiles/file/notitogowime.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8864c932---zusip.pdf
    • http://stevis.cz/files/file/12994415627.pdf
    • http://netmutum.com/userfiles/file/pasavotejinelaw.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/42b27ebfb3c63c3a53e827a08a586546/pelefepuzekunil.pdf
    • https://belhasasecurity.com/userfiles/file/jikakijuwugomo.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be225478417---45837632630.pdf
    • https://amrapalispot.com/userfiles/file/68916020756.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=multiplication+rules+for+negative+and+positive+numbers
    • 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_off0000e2ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16792 bytes
font_01_sfnt_off0000fae0.bin
3c2b5cad2c0c0ba9acde41f535ebc5be98461bb84776d9003af0098735fed674		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 17304 bytes
font_02_sfnt_off000127b8.bin
401edbe84616c3018bc84914e62726ca8e4e3a815c5065ce1eb7632356ec4060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 11260 bytes

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