Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5024086ce18581…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 22:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdf54a6ac928a983d75f3092edbcaa08 SHA-1: 1337f8eeb8afbbc6b239aeae7ed85050f34ecb93 SHA-256: cf5024086ce18581743bad3548499a2b96c82c443bcc06d60b2e15832264edca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077103c32fae---41673523815.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/91011488098.pdf
    • http://rana-international.com/userfiles/files/mefafaz.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c502f552---27567005336.pdf
    • https://aterhesseg.com/up_image/file/67992597557.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8b166ee715384034f0b18d49361bb16a/malabowedotojoxilid.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6lskh5t1ippt3e89gvp7kel3d3/dufimadofovesiziwivi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608829bfe596f---44346969151.pdf
    • http://cathugo.de/res/wysiwyg/file/20438525995.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/408cdb8ac6680bbd518f3385d343ea54/dagosokedefume.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c16201b24---62456017860.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ff371f8f8cfcca252cf044de8398027/xukorobexipepozevupejofi.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb669d549---nobebokoxugisotesivo.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c2pssjklkp25f3k2v6pd67fj42/pibokofinavivibemufazuxi.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a2e0cf45---61817359561.pdf
    • http://ongnuocdenhat.com/upload/files/sanevuxenufarofexiratan.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/91aa0c244083702282ca30e9baa2077e/womibepezuxuse.pdf
    • http://perles-del-beya.com/userfiles/file/43990305023.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/etvr93ltsnlup57jbkak9668cu/momiporisaxipojata.pdf
    • http://gps-tw.com/CKEdit/upload/files/sosoduziju.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/15be7cb56e41a6b3bed0b65baa7cfbf7/mejisomepufe.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8408a996f---fobijowifidoxutopu.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae8b85c28---gugulozepuguzeta.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702562b1e9---topovexisosojotagibu.pdf
    • http://redactron.com/userfiles/file/34104895250.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=in+betweens+meaning
    • 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_off0001045e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
font_01_sfnt_off00011c75.bin
1abe64e10ba2a7e180ac75252c86756f9dbbf8c7cedfb1587bf11d856201fe83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 10360 bytes
font_02_sfnt_off000133ea.bin
b5cd8273ae6d4d683a1ac95bfe11cd62f622c1cceee13608c07ac5aff6a9937e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 18696 bytes

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