Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81959f2fafef4b2…

MALICIOUS

PDF

96.3 KB Created: 2021-07-18 14:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b970410e946b92fe175a2627918fd705 SHA-1: 5ae0e6086f40f9782ad43355a200adc4e766fd63 SHA-256: c81959f2fafef4b23eb387ff979fbffa989861d44e360a675e76231426fc332d
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 functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malware or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results or lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://bizbecho.com/pa/trainstation/uploads/image/file/fabusesize.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c1a73cac---biriguwogigap.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/59080748160.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/vekud.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7bed882c3598b5c5e19995048cda8120/64915512612.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1e237692790b3ea05a8b28b9b263466a/ribakoluf.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/83221050029.pdfIn PDF document text
    • http://sun-tes.ru/files/file/bazofiluwabatatev.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/petorasuxobaw.pdfIn PDF document text
    • https://anup.bo/images/files/25709118691.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2otgo145elenuku350svmafn44/17268190011.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f225e711f180809a2f19741351c13115/nidibejozaguzemivulo.pdfIn PDF document text
    • http://kezmosas.hu/files/file/16293616055.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/mpdqfuuef5sbg4dcjk2qno08io/23589354279.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bb5633fd7858de7547eb9fae3cfc9265/vazededevobegipefukoja.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/93639918148.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd67ae2a---84440851817.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/12114160661.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/99507714607.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/79306d9de501720b94a033c6ec40b9d5/46492134682.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a9154098---posufuze.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8850be6b---fatixaloketuwemuzopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kannada+novels+and+books+free+downloadPDF 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_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 15364 bytes
SHA-256: cf6030f7a111d459428fd90d711f603d41d586af102e6712a79466acbf286dfd
font_02_sfnt_off00015bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF1 10532 bytes
SHA-256: 1c91a19bdfc0b58f9d1b55381243e06a3b6b1e4e8dd731c86a1f979f65310ec6

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