Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb4c5b874c74a25…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 14:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f27d8b1c4f65cc127781d1281a14b12c SHA-1: 132cf2acc4c70023c1b67df97c2d9f997625a9c1 SHA-256: edb4c5b874c74a257f6302e56f2594829c1058ea2a26e18a3191483647692544
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/db947bf5a0c373fb81664565b0292428/25249538094.pdf In PDF document text
    • https://ashleymongolia.mn/uploads/files/91889692336.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/repcfkjatchh1mqkr73ov35eg3/73575949387.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083337a3e39f---xapabadazulifenisozapajor.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ac141736---ropovexajoxejo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd98ce9f85a---roxemiwofugexokebeboz.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/tonulovivotetos.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/47136d88a05b91fff3603faebef3812a/48841998139.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/539e1b5fd864492f2f267d5b19fdbb37/83980651888.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/97446130501.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/15841207913.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160771bd2e1e90---gaduvit.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/91155250753.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/57049029475.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/domudalesozufina.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c099d335d---bunepomonamepomivepipa.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/86504db56d083411b5705537fcd09832/65950775532.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/43185986971.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/39861805092.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/saloxumikotugonezuwifupej.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/10953851044.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a444854c36---46081996968.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6122aeab381ad8fac5e33a418aa554a4/kupisidopilozo.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/79716677678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=la+belle+au+bois+dormant+les+fr%C3%A8res+grimm+pdfPDF 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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 11196 bytes
SHA-256: 420b7fecb5ff429ac3fed317be9b7b9a0ced6343251ba38caed0403e002eebbe
font_02_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 19620 bytes
SHA-256: 1e0690543a9fc3bd3d5a05aacfec338d05c341bae8b6c48a38d91b0a78a5f5bc

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