Malicious PDF — malware analysis report

Static analysis result for SHA-256 9491409b65b48dad…

MALICIOUS

PDF

72.6 KB Created: 2021-06-29 12:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38b602c7a73743629a516e7524b242ee SHA-1: 8950b43d01d7d87fe48131c7fe52fef8db991504 SHA-256: 9491409b65b48dadac3eb3289d71409dffeef0c176f2a2dcc26f32715315e378
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://planetamama.ru/files/file/kiliwefurupabijoretinu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/da68258f4d57fe3700144fe0baeaa7c3/76329878002.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c227e9265b1---vanodokurezixoledigog.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c495da75a61---72819440740.pdf
    • http://geredekombiservisi.com/userfiles/file/71928897587.pdf
    • http://cuatro-pr.org/sites/default/files/file/98124965927.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/11833989729.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082353cbfc37---zevibige.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d965504c16d---62410760699.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df6aae470---16104244486.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/89d476c5d12d07bd391fbc7e6b090185/kidefixesipo.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/52ac1cfa76964294b4035b87ebe4afd1/vubavikazalaxur.pdf
    • https://invest.pl/userfiles/file/55799543868.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/941e9f0e9d6690a5a0ea77897fcb6ed6/35503237594.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2d07fda576d6801473da36fb70b5072/karuruzadikasadaviri.pdf
    • http://temple.mo/userfiles/file/99981686052.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1bfd646d664339a6e5c9bf2c3bf98b01/55843767403.pdf
    • http://chandigarhdatarecovery.com/files/file/96134688180.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842a6744d77---41822907223.pdf
    • https://studiovizia.com/webroot/img/content/files/pozowivafike.pdf
    • https://psfund.org/public/uploads/files/cms_files/felozawogilirati.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e72bc86854---77382234821.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160755e1332337---badibix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=practice+7+6+systems+of+linear+inequalities+answers
    • 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_off0000b8f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F8 16792 bytes
font_01_sfnt_off0000d10a.bin
6941729243287dac5f44139a894ae66f6346e8548d049ab7502894d6406d45bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 16024 bytes
font_02_sfnt_off0000fa82.bin
502312d5e68ccf261e2be6078e6703728caba61903d55e5069d1ffc2c1f7ca25
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 11160 bytes