Malicious PDF — malware analysis report

Static analysis result for SHA-256 45edbe8d1941c029…

MALICIOUS

PDF

83.4 KB Created: 2021-07-31 19:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fce9c381ab097d1b0f708c2c596e76c0 SHA-1: b7324369795a7358034eb3707d513ee9bcaa469c SHA-256: 45edbe8d1941c029d552d46f0f978ad47204d7815616144c1d5f17f5ac0cda17
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links are designed to act as a link farm, likely to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e36766b62---15804238505.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce961c483---38462436872.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608254fbd01d0---860552867.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/57104003536.pdf
    • http://www.cddfct.com/up_files/file/53894152428.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5i1494s8p3jht1sosg8r1adja7/zorixubamemaxomedoparaka.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb24ade4d---wevopebivemajoposemag.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c9e55869---xejogi.pdf
    • https://cleaner.pl/userfiles/file/jokinetit.pdf
    • http://foto-klub.dk/userfiles/file/60076737371.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/52592471375.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gabagewefevaruw.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550e9d3e8a---97881624086.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b253bf53d9b---viluvubinajisufogaj.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/520075801.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/44602ebfcf37826d4d65dbb04aafeab4/9377070333.pdf
    • https://eberli-medical-supply.ch/upload/file/73885027859.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/eae751a9b369c3f3ce2bac76be4bef92/nidagabumavinidivev.pdf
    • https://chrmglobal.com/userfiles/file/lafumemewoda.pdf
    • https://ludifrance.fr/userfiles/file/ginogulogafijarajus.pdf
    • https://peterdegendt.be/file/wedozu.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c17556150---jolaxilujoravupel.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/59bced66d24038b01ab45a667eed6237/sowiful.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vquk0nah1ri63ditq6jlgeag34/fenukujowofudiduwedopu.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7fd345f9---gozafidefodovuka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=to+kill+a+mockingbird+summary+chapter+23
    • 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_off0000e12d.bin
9b6732d2b5260bc7b98f824c2041ee13ba467b64bb24591899601b158bd255e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16256 bytes
font_01_sfnt_off00010b1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 16792 bytes
font_02_sfnt_off00012335.bin
761f73379fe9cc4f8dc5258e34794eefd0362f6f81ee883d080cbebfa4f63c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 11664 bytes