Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf53721548f2e4a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 02:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0ae402d63172dcee067f67797e132f7 SHA-1: 894bb097f4a4232009d1db06f708be49916ddad9 SHA-256: 9cf53721548f2e4aba775ce1415ea53dd4e707e68fccf1ff52e87c936e93e4e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, suggesting a link farm designed to redirect users. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable domains, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=consumer+behaviour+theory+approaches+and+models+pdf PDF link annotation
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56fa9e0e4---13982943756.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429214336846975.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/92037755403.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/44131713095.pdfIn PDF document text
    • http://cfi-registration.org/buzzboxgift/img/userfiles/files/godomabirisebinudag.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/20878586356.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b6d20e134---tofagupo.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160948a93c35f9---teduda.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a2f295b8946eb751d93dff504a96e8a/dobovedokekifogenibisev.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/77838586022.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca882169f6---judadena.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/p4ckt1dllf43ok62qcg9mu8cn3/losir.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077200050e6c---23279731150.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/lewegenigusoduribezubaz.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/6281cee4e23b44d3bf0c5c609ffc7040/92007250518.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/63290555734.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630103577.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/19893914270.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfa31a8f6---tisowaluruxisogixujorow.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/57825030828.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/takikibux.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4085360294---vuvekemogazonogodovakefol.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae06b501c7---vovekizoxedefasolufetanal.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/72015937753.pdfIn PDF document text
    • 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_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 11336 bytes
SHA-256: b7c99cbeecbe40e95c568704e2ede8f3043eec3859ad6100350f6fe95563fe7d
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 17680 bytes
SHA-256: 20d0f021d09a0fa310495ce0bd1fc228604c6d7f2c49bc43fd21ae8b8c455570
font_02_sfnt_off000137bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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