Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46af8b0119e13c8…

MALICIOUS

PDF

84.0 KB Created: 2021-08-07 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9664c668197e1b2d74f604702c99cf66 SHA-1: 98b7c4ba4073b45a2ab7be0d10388dafcaa25179 SHA-256: b46af8b0119e13c879ff06ac29f2f31e2c2ed2aeb192870102d363e5ea2cd375
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or to host further malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a tactic to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://finpacecuador.com/userfiles/file/zelunubataned.pdf In PDF document text
    • http://southport1969.com/clients/861680/File/fitudapezasig.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u7jagith0soramc6n1faiedc7c/46146285944.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b27c0bae050---58612666134.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d6e0d670f---bewokusesago.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/pifudazutoguru.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/tovowawexobiwisitadonol.pdfIn PDF document text
    • https://curvy.tw/upload/files/9489174393.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/44923998787.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f825efc8e8e---pukevikotasezutixotubu.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/livovepagixap.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/gegowamizufugejevevato.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/lixosekawidu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vixito.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d6970ab4f5272068247209136e3d4bbd/15063911485.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb329f92e74---zelavet.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/41804861436.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c437791e6df---22044762643.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f243f25574---58587398210.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160985d69ee6a9---18422638510.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/68187085246.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/66909069681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=o+grande+hotel+budapeste+filme+online+legendadoPDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 19096 bytes
SHA-256: 7bb98fe9f704860db2df6b1d4621229724fc2496a94fedc6e38f9a99815d0483
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 11212 bytes
SHA-256: 845fcb888e1469bc2100d2d5c25ecd019684620ca5b3380efa25771199cfb540

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