Malicious PDF — malware analysis report

Static analysis result for SHA-256 363b63a458930fc5…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 10:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1caf9baced429121fc2304849806acb1 SHA-1: ce6675c7f7162629efb2fdbbe3743c5d53188ef3 SHA-256: 363b63a458930fc5b9fbf0a884bdb33a6cec31a1775522f409c5b139a7018d30
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an effort to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/jelevade.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/65psauhf62etucv9pvjpff4h85/digowoxoberejafib.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa4f134125---fobadedovezu.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf5eb2b85---74993250211.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3c00cc0474b03fb99658e0d18f5ff4d/jutabuzereroxukoriwuxuwa.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7abc9192fe---pakigukatekixakiko.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079db7f9dd79---23895330541.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfeae52d92a83b0e66b84af771849ffa/botufamevinaxisusotux.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aba838ea1---4471536385.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2bc68d1c---xuresox.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c5139166d3e711a7e5e4bee00103d24c/78385716780.pdf
    • https://ekransamara.ru/files/24261261718.pdf
    • http://ya-ke.cn/admin/upload/85947075489.pdf
    • http://bafiti.com/sklep/userfiles/file/mezutusasaberivus.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/7a05ba1162824fce97df000bba3d950a/65548271728.pdf
    • http://msslink.ru/userfiles/files/48180684563.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/uefs70f1kjuli07goegoa7l0n7/silafusabilixazidasix.pdf
    • http://usmleworkout.com/files/file/mirebolo.pdf
    • http://sola-brothers.com/userfiles/file/medaximalijagiso.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f9769a270f1282f7aa34e0d481760ec8/busuguzoxibozo.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd21e6f5a---33559140823.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f93cb9d0857b19b99481e334afdd02a7/fovobekatabodu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apparel+industry+in+india+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_off0000eb84.bin
1ec58e3aaa7cf076e4408d5b1e84ff243fadee617dd36780aee0db88658fb075
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 16676 bytes
font_01_sfnt_off000116ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 16792 bytes
font_02_sfnt_off00012f01.bin
5a1ae13b31115af74d69098f2b33c6df7d0ae1848ea50db488b2c866bcb1c290
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10568 bytes