Malicious PDF — malware analysis report

Static analysis result for SHA-256 79522b0f56d31147…

MALICIOUS

PDF

91.5 KB Created: 2021-07-22 08:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 818cb1dcae0f712debc778b43f7d8eeb SHA-1: cf6fc60c623787c2453919a3e5ced54a199ada95 SHA-256: 79522b0f56d3114722c64c3c1f4922ef75384e790d0cb3fe67e808bece09df0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS platforms or disposable domains. The PDF structure and embedded links suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://remont-elektro.eu/archiv/file/fawosopewukemixawiloj.pdf In PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/wevalaluzabid.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///34064171097.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eba0994d5---mewoponixusadajigosutava.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9b25f0d7---61281414668.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/85767132928.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/57324678703.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/88285289989.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/64567041959.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kegupurodep.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/vefifuwikokobegozibofeg.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098513e0d97c---pesuluzetoxovutugok.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bizosudadojigegumiduganud.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9becacb4f7cb8d756d375229a95acc47/vijovatonedawozepasosumaj.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d63c638a---sirolefimoduvaminoj.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/25874404855.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/buxugedokiliwipebuxoz.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/270bb8897d66d2cf7970d42f671bc52b/98085530776.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/abcj2f4dqe2rlhmfn17p2q05m7/wabewixikawebetogosa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f7c248f5d30633afb7549216d27aa792/43588870866.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b7e1a2160e758cb474f740807587abf4/fowetarizewikodumanin.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12f1eb905---kelanaxuritup.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/bigekatitoju.pdfIn PDF document text
    • https://kristinanamaste.eu/files/49996848984.pdfIn PDF document text
    • http://debden.org/userfiles/file/gekesusomodor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=this+is+retardedPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d0708b584f194f14fcab106b5c79dd8f/linizitinimarudexetexuser.pdfIn PDF document text
    • 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_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 18104 bytes
SHA-256: eff96277c7b64e5f9b591c5463a48b0bf4e3c55fd1c83783f92b360b3d3ef8f8
font_01_sfnt_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C2 10036 bytes
SHA-256: 172ca630c3b551a6e580577685f628f9704d6a84d3e734eebe4a13515869f501