Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc163f62ad76ee41…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 04:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d173dbef91cfa2c267ea7b81f3fc3699 SHA-1: 3bbac8c77eed2ebf711912447ac9d61683e1a721 SHA-256: cc163f62ad76ee41abc27b9a28403f88f4e6b6d5c3161bb857d9fc3962899d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to potentially harmful external sites.

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://cructi.ru/uplcv?utm_term=lista+de+exercicios+tecido+epitelial+pdf PDF link annotation
    • http://ansing.nl/userfiles/file/39636507123.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/5313806179.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/32903862164.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/418327cfebbcc65a65edd49709988095/jidofotazes.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2613dff49---rasidiweli.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d09558d4fa---diwagilakiwixaravab.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfnbn6vnvl4500vib79hhdvee1/runebik.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e67a0d97d4a---82028022278.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/8423721203.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/73000193377.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d8cc5ba653df20ee1f86882ceda2c983/xudisifijotit.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850fa0a7f80---83374867029.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/tobavebawekakowo.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/18213265181.pdfIn PDF document text
    • https://puppometalli.eu/file/wenala.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/97817854082.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/tegumefovopijuxupup.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3ecc0d6b---73754395229.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/208e53eaa0f0e817f90de0cb45f6a0c5/31172513152.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/39308374352.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/45b098b722aaec603b3990d17477df6f/kulefixegujizofuvif.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/a2ofuc9vbp4tjsmis8k94hmaf9/nebuzexori.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/gakawuzabenevolawafox.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/wuwusavelidegesanobizuxus.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_off0000bd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 16928 bytes
SHA-256: fdf4845927f798c56bd2b8bf8a09ce654b26ade3cd8696cefc90cff3f6fff337
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10568 bytes
SHA-256: df076b9b948a70fdb906fd2454a024a675c5cc750aebe90a306ecde44915ab6d

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