Malicious PDF — malware analysis report

Static analysis result for SHA-256 c162013b4c251ea0…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 16:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23f108936ee91c7a862ecbad225d99f6 SHA-1: 315d080b362a8d8c173c5a05ced8e0fb67f1e4be SHA-256: c162013b4c251ea0d85bc288b00e72166af3f8ca021ed397e3612fc183e73df7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for credential harvesting or further malware delivery. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://supermarketdv.ru/files/file/7290051368.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/87uur1qej1t8to8s56e9r8a8n0/68260317321.pdf
    • http://stark-tools.ru/images/uploaded/nedofugazuxefuwuvabut.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde9896062---wovuterakimemidanufekanel.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dd79662970a5cd39d99300dd2857a55f/23480985251.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/19797815995.pdf
    • https://bandai-k.com/userfiles/file/vitonuxubifawajuma.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0d48bd94831049d7666e3ec1165024d5/xokikesofinarunelosorol.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc9ad8b34---27423711784.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9b29af91---fivudovetono.pdf
    • https://aduanaldelvalle.com/userfiles/file/siwanigesuzekaseg.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b4ba00c9fc93cc4c291e0ffbec234629/85288351127.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d3c26839---70374131371.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b533fedf0364422ceb28576aadd00f9d/56551566280.pdf
    • http://watthaistuttgart.de/userfiles/file/romeruxopagiponul.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab49d67a4bb---11374067868.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6lq66kfue62kkhbe9dj83tkjkj/letego.pdf
    • http://studiodrago.eu/userfiles/files/26898818328.pdf
    • http://geyikkimya.com/userfiles/upload/file/guwolozezoxalemi.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d94dc01dab83db7ffcdd283988aac68/49173104174.pdf
    • https://rubenoferro.com/userfiles/file/fojedituvolujijale.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907ef762abf---tusavedenabimidixinew.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4723bc063a---73138347520.pdf
    • http://pytextiles.com/userfiles/file/gafonazanada.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607156fe3081c---nasuzixodim.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a11baf48d36---ziregan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=past+continuous+work
    • 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_off0000f107.bin
1acb1992b25bd16d64a7b070cfa0863238668d60a1bbb16e275b339e0d2dd2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 17476 bytes
font_01_sfnt_off00011e43.bin
2f81da90fe8a3cc7c3ff137b1d0002dcec086ae9f9d60a0df1452e7bd153166f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 10324 bytes
font_02_sfnt_off000135cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 16792 bytes

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