Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5055acef8bb1251…

MALICIOUS

PDF

80.5 KB Created: 2021-08-15 15:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 24cb17c7e7f0937a76f6dd50cc8b01da SHA-1: 12d569038710d2a51a780980d56b4edc315f9a5c SHA-256: e5055acef8bb12511c1c612b7a22b86b516935c7083663dafd206fb048bbff02
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://drafthe.ru/uplcv?utm_term=how+to+turn+off+heyday+earbuds PDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/nlqlg2k40tbbhela9faqk4kt97/83747358841.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790a2862b8---59207651228.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/96497427667.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743eae6efed---nikifularesupuxogud.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/15465666885.pdfIn PDF document text
    • http://melabo.com/upload/files/98751474922.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/rebukuma.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/afa0c1912ad75012136673f07da78ad4/nuzozudiguponobe.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608786683676f---33292393221.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/24270478028.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c49de81df0d---94808331674.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41fcefb37---neruvadanojivavixevane.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/96867656546.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zabokawuvaxirutaforiba.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7c0edcf7d---faweleve.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/panunikivevedetafobize.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/gugudovisolelorivudukemoz.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/depugu.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/70701348130.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/kidoxaxuzutunebexuxi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9a323f01466cee41de2996b10f4276bc/99121747696.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 16880 bytes
SHA-256: d31a1814a17795b0ce7166ff08e6d856958b10eb840259754145aee85b550247
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 10744 bytes
SHA-256: 3125f40ae8af38fa7be17bbde70f6bb6a2e28fb1bb9c85f15bcc3f991ffedae9
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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