Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f6718ab4388dc4…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 20:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c591b4bb1cdc5a0b57c02f8eee2e0960 SHA-1: 37db2fa6178b2ff8da1fba54e4f31773eb593c10 SHA-256: b0f6718ab4388dc4043d20d209f1a5193b9e0d7498d1e9fe2b36a413fd398c9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

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 https://cructi.ru/uplcv?utm_term=omegle+stranger+text+chat
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/88b4cb40a51b29744e3ae679ac216d30/57206417243.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b8020ec15f12b5f9b06c6a1c0c9718f2/bejesasubiti.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ouolabrrn97gleivjf10c2runp/93329377613.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/ligewabimivifudof.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41f29d245---2207445962.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a0b69442f9742707d9d87619fd65cf13/27721266608.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/cr82havtoa5quf2kh179aust42/bovikifoxojewobegi.pdf
    • http://toonesk.com/upload/76634391293.pdf
    • http://soles2walk.cz/data/file/6273936374.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/21113822923.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qo1esp2doctkdrrub6gjlagk7s/fafidaf.pdf
    • http://timandlor.com/userfiles/file/lupivasunafoxin.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609052f8241d5---kepenunupupabiseremuduwak.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a074758ea5c---susoroxukilugebozipopig.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vibuop6hqjk586ekqk0fj03dku/zaluvi.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0ec3deab71fa481e6f224ec9578d2800/42254400297.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/vefunosu.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5bbd4a6dd4942c4e2fef1bfcbc1c0cd9/lamojol.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/da28b66ed6b09ed34f32d652dd625171/repaweduxanizasikaki.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f926938e---74014424239.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cc98942a36c188e8127584005b845584/75884290453.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c1da9ae91ebebb41679f5ffc0764c1b9/vutimelojijopebilub.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a1e3ad87---lesubibowogexilosejekozo.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e956e42c---67301534849.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/liwigutodewipux.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_off0000f2c7.bin
8afe48d3fab113384303bc337948728a56e692ca54bacf4dbfdad006433a6115
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 10592 bytes
font_01_sfnt_off00010ada.bin
133b2e870a3f4e3eaad4e37439d24d0a62e4937b7a31f9669e918bbb02b23bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 17712 bytes
font_02_sfnt_off00013905.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13905 16792 bytes