Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08f998ee6ca7e81…

MALICIOUS

PDF

77.1 KB Created: 2021-08-28 09:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baa91e1e9df432326049de105d27ad73 SHA-1: bbef56b49aed1262d1303fc792d84839a7bd6f58 SHA-256: c08f998ee6ca7e81bddb8a3e9d1cd1257f8388d4d34a44838ebca9325e30730d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to numerous compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://philabc.ru/uplcv?utm_term=how+many+hours+a+week+do+teachers+get+paid+for
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160713cbe38ea8---95439957454.pdf
    • http://sns-russia.ru/userfiles/file/fejowu.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1850c1d653a9f2752872a883e820703a/gelozixur.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/8049186827.pdf
    • http://havefuntogether.com/image/upload/File/duren.pdf
    • http://alpha-th.com/userfiles/file/58111737215.pdf
    • http://duszek-lasu.pl/userfiles/file/babezurovunukowubenajili.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c9d54c56f56836098b7c5d4f92378a5b/daxugiwirixenad.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tits8b9u82jgoe7m512v7hh542/36943009972.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c74d76223---joroda.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/gudavafejivob.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af4087066f2---32353645927.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070df00d5815---vuteresakabiboro.pdf
    • http://membranekeyboard.pl/_data/file/85334569915.pdf
    • http://eiak.org/upload/editor/files/72553157915.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e91466290c97ce765f794b7c1b16dab4/zelef.pdf
    • https://kildevangen.dk/files/xokiwid.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/11129685524.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e10acca7c---lepabarijeg.pdf
    • https://dhesient.com/media/podepivubizogovivanob.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9e3ed005260c257354c05b0bca9fde22/99016200474.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1cfcfe3ddb1bb09f5de37bfb0662dc4a/kazumavujugizin.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/14978239281.pdf
    • https://n-v-v.dk/userfiles/file/garuba.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/53f71def9db36a402fcfece4c1bc61d2/37510515814.pdf
    • https://bd-sokolovska.eu/userfiles/file/22135488442.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/05a073dd3deacba8dbe05f4ffbf1b632/91012095057.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24d4532a5d---29809695628.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_off0000c7e7.bin
cb4acfb7172608b6c24fbfc109e452148ca35d1c129206f01769f22172d545a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 16740 bytes
font_01_sfnt_off0000f285.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 16792 bytes
font_02_sfnt_off00010a9c.bin
23c79b2242095cdcedafb6f5181a479f2487772be707d420d592e624d840e909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 11404 bytes

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