Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9918d9ab8e34b70…

MALICIOUS

PDF

92.1 KB Created: 2021-07-16 12:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7baba990d9e7bb91487fd34ebfebb91a SHA-1: bda614e41a3e4a63dfc839efef5e0920f500de64 SHA-256: f9918d9ab8e34b70972639e6cd13f210ff26b5f228887e8e47bb497cc6e32101
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs suggest a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://krisoc.ru/uplcv?utm_term=dungeon+quest+cosmetic
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ac904776---sebinutatomasox.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/77aa9329321b6a2a409871648b22a530/nolokug.pdf
    • https://mallncart.com/userfiles/files/xozumabo.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cad91d8aa1e---zogibetatofu.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/76424765285.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4fe3ea7d---lazajem.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/sunaboneniwuga.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715746bbe49---45042168728.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/42739329463.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/xutukidapufovaz.pdf
    • http://acecaalcoy.com/userfiles/file/76997308895.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e12775313---vapoxux.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d7f5f0838afc130725480bff977eedc4/durepevitazibuf.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0215ec557132a9929be3be74ca0c8c14/26648015331.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608558ed95c52---18448459279.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57cb5157---71094949090.pdf
    • http://bjsprt.com/uploadfile/file///2021052305434718.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160702e36d34c6---54574493266.pdf
    • http://af.ssla.ru/images/fornews/files/naxojimutopijimedotiw.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2ddbd0e092540c633765b9298fb1901a/6280019299.pdf
    • http://susutour.com/userfile/file/notapi.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mc0kmm7dmom2cgq23iplmd7kb1/55118639074.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd71a4dcbf---runurizopevo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010617.bin
cba9ab4b2f3e463418f0af0ef01c4268eff2f749f855ff51dcc6861a545bc161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 17244 bytes
font_01_sfnt_off0001336e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 16792 bytes
font_02_sfnt_off00014b85.bin
37dcc80936bcdd7afb93b91a4efb74564a6656007df0f449a9cffe5e5a3e499b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B85 10512 bytes

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