Malicious PDF — malware analysis report

Static analysis result for SHA-256 c946cf3160752e53…

MALICIOUS

PDF

179.9 KB Created: 2021-07-01 11:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1ebbf359901e37956f2fa0cae94e58bb SHA-1: 804272eff0b9c9eba168f44898d2874c0a495d86 SHA-256: c946cf3160752e53e54c6061371107441c567237f4f9e8c355668b4739c25312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g8im81ag2pmoo7dsqj5empvqo0/xawawir.pdf In PDF document text
    • https://bbpartner.cz/userfiles/file/14303424114.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fj9fcn32dplidg6422fadunel/robigema.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/rugunuwilajazexobifegejo.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zofinomofakezejejozisuvaz.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xexakopure.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/38128678333.pdfIn PDF document text
    • http://ktcz.eu/files/files/49278583396.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/58293206311.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/708e6fd281ff1af9b89e9cbd205c9014/43164705670.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12b2cc607---62460502499.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41029bc559---posaviwutusonizin.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m29upk91o6qpnvf85h7db17d45/rabamidevi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160872e16d5d85---lenuvikojoxaxu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef721b0cb---38433025974.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb11caf999---7818473170.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d1b4b8193---femidexipajogemamuvatel.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nepalewabipo.pdfIn PDF document text
    • http://yuha.be/_files/file/xarivixukawurowupazedobux.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fb7ac152b60f115543a3a954a53ce4bf/29113794944.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/78315274904.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c17607ea4da9926447904d90f23b0356/11408662708.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3252e380---zufanowesagopomomibixex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=midpoints+of+trianglesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000246af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246AF 10668 bytes
SHA-256: 4a1b740578729e8376ae0f2594f13a19efed675aca95aad2632c24878c9c2075
font_01_sfnt_off00025f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27717 19416 bytes
SHA-256: 43cf1f8da8d65acaad2bf4b86287744cd6392ad4603b868337c03ebf40cc70ea
font_03_sfnt_off0002aba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABA9 16328 bytes
SHA-256: 85feb91b1f9619bd8fa67175e51774d11ceb5dc0144f13d51f2ab751b3cae31a

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