Malicious PDF — malware analysis report

Static analysis result for SHA-256 611673fc37f80470…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 08:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9475630bfc9fe32dac45a4eab6965bba SHA-1: 372f7ef94377231a71384ea53a0741c02790820b SHA-256: 611673fc37f804702d81c2912b06e6df6d1cdd5ec513d2e21340414c895d907d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are designed to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u9u0lqk1j77ndjqko495ep3npe/88405142473.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e644e429---99165296510.pdf
    • https://gastriklandsbf.se/UserFiles/files/85887481033.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20cbdcecd---27407015391.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d336c07e6976bd00b7a24ac1a1364237/sijajud.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bf62b514---xanikemerevim.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d9d710ca1---dunavezu.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c059bb86f2f4b8b61f2cfadf2ddd6e04/2843465285.pdf
    • http://unicorn-furnitures.com/d/files/65205735788.pdf
    • http://beiks.info/public/file/86053226247.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1612104a5---66966675686.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160752cf2f0908---gutotolege.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbfd6e85f---xitibaloli.pdf
    • http://cloverdiamond.com/file/suvopopetozenabusemarovu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8a23eb5c---ratovagunijojir.pdf
    • http://xboxheerlen.nl/userfiles/file/bagukixu.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/17d0245c8a27d7f806782dad7ebe5054/wegatagatisasulos.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3d83f8cd2221dd48fcb580041df7a9e3/57013493256.pdf
    • http://fygl.net/uploads/file/300743268944.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0dfb9318f2becceb763987a9c5057b6e/xomapetumikajafikadazixaf.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46ff42c8a---xozijuzikupuxowudarig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+watch+the+marvel+movies+in+order+of+release
    • 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_off0001069c.bin
7cf20668344267c2193f2d59d6f9a7f137c288f651e8d8a308f7e8c186fda76e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 17084 bytes
font_01_sfnt_off00013348.bin
4c12cf2b79b7c4a609a3ef168d38d2d8b4ff459455c8630c21bac73173915b70
pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 10884 bytes
font_02_sfnt_off00014c48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C48 16792 bytes