Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c266fc350c24bde…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 10:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c565d577d65e01dc7bafaf1557a9492 SHA-1: b6376e2573ad522d565c1478a39c880f81596781 SHA-256: 2c266fc350c24bdebdf53c350d36497467debab748ed04bba78d044c77a2043e
216 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it is a link farm pointing to compromised WordPress uploads and disposable hosting, likely intended to deliver a password-protected archive. The embedded URLs and the PDF's structure suggest a phishing or social engineering attack to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://anhbanglaw.com/userfiles/file/genarenugijalazavidataz.pdf
    • https://steklo-shik.ru/userfiles/file/guvopozib.pdf
    • http://nutronicltd.com/userfiles/file/97881189170.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/97141532418.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03c9c32ad---39844083569.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/82836861526.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d692391c9---30704590250.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8563ce63---79227028783.pdf
    • http://marta-galan.com/files/varios/file/zuxuxavopexapede.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160740e7eecb0b---mabirikebebeful.pdf
    • https://purefeeling8.com/data/file/tumirizejemiti.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780deb99b98---26440951922.pdf
    • http://churchtextile.com/userfiles/file/43256220670.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/v9q7lo4ngijq8qu1l8r0blug34/6746695071.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6b825a5d---zamifamosejinorekinavuref.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e680de4b824f8e53802e0e6485c78011/23630601863.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g14p0bkcalv5i7f7ulg5nj4c0l/64134602623.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b05b8ed6f8302a0e2985c6f6f5b7c0e9/nowigafixelekuw.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffadbe7d76---83968764714.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160928d11c2890---1342615396.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/33761e0675efda01684e31a6171a2bdb/22011774280.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02a0aa86b---84733533569.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d39e9f95---rarudoreriw.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13f820fad---nufufavewixikedonaju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=guided+access+triple+click+not+working
    • 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_off0000ecf9.bin
0e69c575148dedb40877e14be2e57b19eb69c9fa44607ee4948933987811eaa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 16720 bytes
font_01_sfnt_off00011893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 16792 bytes
font_02_sfnt_off000130aa.bin
7bc49cb7e27069d0d9f492be1a030fc8ca12488633f2a4a9d554eefc2ba69430
pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 11004 bytes