Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfc8d6289e9ad78…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 21:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13df175f47ecc1f1c8cf3c89d8d290fb SHA-1: a6496718eca746b0aea594cd8d7e534c302bd617 SHA-256: fcfc8d6289e9ad783c43787e3940072892e1910cf74caaf1f754d71e038581a6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure points to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=quantum+numbers+practice+worksheet+with+answers+pdf PDF link annotation
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/wizuvomav.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/ravaje.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d1087ac4---xosutaratoz.pdfIn PDF document text
    • https://coil.hk/upload/files/70174832108.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a16788739ae---51404696254.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/594354474.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rcs79tlv1q91a0b0pmrainmjn0/ridadinavatofufugedikiv.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/971e67d1dab6fddcbd4cae496b5a42dd/nonibazogaw.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec5c31ffb---kulekomavozifubax.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085a099b90e5---nejevufululuvot.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/60056534790.pdfIn PDF document text
    • https://bloomeng.com/uploads/22986969152.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/444228839792ecddc57f18ca36d173f0/wiratanabidegew.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/98467292416.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tawekodujabovigepo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1784ffc8e61cff107158f33b37e0a8c4/7260746682.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/23239170442.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b504bb00e4fff3ba3e11da2fdebf67f1/64891225617.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/60ac2dbd288072bd66c0867359c175fe/dufikufoxitudugejezepijem.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/sakok.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///febusabapi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/69124703591.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/nijurejamorawotefupek.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_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 11316 bytes
SHA-256: bf36af22f0154e54c0d38059f399844d4b4c4487188962233994d555853e98be
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 17888 bytes
SHA-256: c1ebf228ee154419837d8057cae9b054bd772caf90c5d056af358e179034c3eb
font_02_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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