Malicious PDF — malware analysis report

Static analysis result for SHA-256 becd59078652cd58…

MALICIOUS

PDF

85.6 KB Created: 2021-08-12 13:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1146a2bd410b81cd15c1ab389cc600e1 SHA-1: 8af42304e47af90025278cba2319c81939a6ea55 SHA-256: becd59078652cd58098cde0f45a0d47e9a8d717ec93af91b7d17b5e3ed630144
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm indicators points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://namthangbasaltstone.com/uploads/image/files/42427354057.pdf In PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/titinugemufujewe.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ec952b32b---22597540783.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a77d0069c---46689887776.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a59330ffc8cad0202269fa970cec8a1d/90486141770.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/15242416033.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/85f0a5e55fca144698ebade92a9a3392.pdfIn PDF document text
    • http://tipiland.net/upload/file/dawajanazebixokogulag.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/kikamuviwerexop.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/navafetedureda.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0c4bc4f7d508a79a7c9b884b68776b99/96425385047.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093add56e10f---tozalatot.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mm9kb2ino5aq77lr7nn6jqcofd/zitawewufigutonababetibug.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/80a153d4f741f815ed3de9646b0ffe8d/puwipera.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0h8ui1tj0iarl0j5dro4s0knc9/kefevujurofojifesaniwuxi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/s5rn11ktlnqbv0g5lv3tirbpu1/tarubudi.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/fijopoleloj.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/timuwidevosura.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f1a22dd4---57068312359.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/lekakixetuvujivoxil.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607599128cef7---83589033302.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/64116649187.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/jevukelomijibinepig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+read+candlesticks+forexPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 16500 bytes
SHA-256: 99a9672b5704316c70d55db4df152999de129b5764a9758360a1d59b6cb67c0e
font_01_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 10740 bytes
SHA-256: 2bcd0b816c99629e198b0e7f52b430f6ad6afa3e96ca4b7bc195d80a2719bdd0
font_02_sfnt_off00013082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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