Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7bef9a8fe5ff1e…

MALICIOUS

PDF

93.8 KB Created: 2021-07-12 23:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d25066aa7daec471f9dbb768e2ee5b71 SHA-1: b5cedaa6043de441e037a824f3e4698a50310d29 SHA-256: 3c7bef9a8fe5ff1ed23f49871ff525d89788963953cf2cec2864707663cc2b6d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=what+is+the+difference+between+uhd+and+full+hd PDF link annotation
    • http://bkdesign.ee/userfiles/file/gufafupuxujozixoboz.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/55530321660.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/63492858802.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/vejit.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zetomimevuxumobubo.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/31106973557.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0a71b0881e0e647d2795f2d8677e6702/kuvafepoxunafomitafutune.pdfIn PDF document text
    • https://adikkedua.com/contents//files/78222183509.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/dapujeroxaremepotab.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b83f5553e0f---dumixinujesapizaxizi.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/51702333794.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09p8kpnrf1l38g8sqhieoro6c5/sorepal.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a052ab56657---ludisawatitisojelufujube.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b664f29be63---93306221102.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/wazupabe.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/59930726938.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/77nl7ogelk4ec58kktoar0m179/xelujojo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ecbeb795---pipafeligaj.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/16141460294.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bccd59fd9---9231797101.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/12267206519.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vblvjh8inb25lgjii9ma6cc0v1/24032524830.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1i1mgrfurf819q2vs7fpm6ccs5/wefasapuwokejutup.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_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 10772 bytes
SHA-256: 27fb406a22887ebd23915c7b6ce9819a7e5cf75ee7e53ef646b1403666ef4cfd
font_01_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 17704 bytes
SHA-256: 5d75acf2179196062d0aa9f341503dbad2eead293fd3e2d13e930578f9f35487
font_02_sfnt_off00015196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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