Malicious PDF — malware analysis report

Static analysis result for SHA-256 6568e6f1de7ae1bc…

MALICIOUS

PDF

102.8 KB Created: 2021-07-03 04:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 637f893c722115d2600d81f981b4be12 SHA-1: 081be1ebf54e1bfa7101885b6b33e9a8e23a71c4 SHA-256: 6568e6f1de7ae1bc228a1198b228d0047e3eb6aa47187e2c9b59634d2247719a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c1e699b052a3c132e05fe88929d5a055/91278809444.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421b4817e4---dakemikibotidir.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///nibuwuzefaludekobabibox.pdfIn PDF document text
    • http://rhondachem.com/d/files/lufajitiro.pdfIn PDF document text
    • http://limoride.net/gallery/file/16836107587.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/15720376278.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/25559908972.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8d64263fe6b0a1bb3839a20b5f68e98d/91176901481.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d50fc8c06---3475343029.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e356e1b3e---39834291375.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/retisiw.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vj03cleemav52clnkhvhjkka56/37662457055.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/44328996913.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/25bab19d241b29b26e6dedd1e0308aae/ladajanagepagagomul.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0387519e---42654000825.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/937813488.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c885d2da99b---supaxekedukizafotimuf.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be86366ce67---15131847537.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/997e1b311229cd7b60fdf913319f07d5/59467524509.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8e1b0eaiemjfi7ndi759t0mglj/72491080613.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/29004265019.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/12500621117.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9c57404e---64303205246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=she+is+so+naivePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 20284 bytes
SHA-256: 3f1f5afb38ac49266b26b4a0e080f5b093ffc10da55f09f771037f536dcdd819
font_01_sfnt_off000156fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F11 10100 bytes
SHA-256: 93c847416fd2f599b69eaa5168fc591c0ff1a589cbe324b792dae9bd3ee34511
font_03_sfnt_off00018585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18585 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a

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