Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2be1af0373cca2…

MALICIOUS

PDF

86.1 KB Created: 2021-08-10 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eac28eff62d68eccf7158255d6339b43 SHA-1: ab091490200647035f7ffc6cd62c956cd8d58606 SHA-256: 0c2be1af0373cca2b688110156a07fff7e69e42ab013d85a4c12f3eb414dce7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, with many links on potentially disposable domains, aligns with tactics used to obscure malicious destinations or distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://psn-monolit.ru/img_file/files/68814859809.pdf In PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/fekewunodidi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd25902493---76125398011.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210731065824275.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xuperorinowebinoki.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/vexigefugikap.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/13668264251.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//fasubugazupidemex.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/88614157676.pdfIn PDF document text
    • http://martonelektro.hu/files/file/50806602643.pdfIn PDF document text
    • https://waroproject.com/file/24142572398.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/mesewibasitofe.pdfIn PDF document text
    • http://aps-mes.com/files/file/1624842898.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160853ec770532---40131807083.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1be91e82---bopafa.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/518e8f3d8561a117e28a827b8b1d6545/migane.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfb98d5d4---detegofikitebezobariwoke.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d0a37f67f---fumenawid.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/zotawamabumu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/12876136938.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/66506236514.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fcab296c4f05476c5885cc91132dfe98/sevow.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/110e344af3e5ff0087cf57aaf8e09d09/rojediwegijafudipox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=daily+schedule+template+excelPDF 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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 10772 bytes
SHA-256: b7f2e4226137500d2e29650f21fb0851bb6f6e013006fe225e955d73f0658241
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 17244 bytes
SHA-256: 419037e955daf40c2ee4b49c13808898b11bf61680f6f68e662a3d700b5890c6

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