Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1c61042f8bad4f…

MALICIOUS

PDF

131.4 KB Created: 2021-09-06 23:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e2f4c6189d069ae483117e95488d81f SHA-1: c8191184718c4449ba9d5e63413ec326d5c83ec0 SHA-256: 8c1c61042f8bad4f780dce66aad429b8dfeee56b2e6efdfe1a23360d0c706daa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://drafthe.ru/uplcv?utm_term=photoacoustic+tomography+pdf PDF link annotation
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sjds1117n2qkp2qse5maoldob6/80601085394.pdfIn PDF document text
    • https://best-label.com/upload/files/giledaje.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/pomuzotasaposaxidibupul.pdfIn PDF document text
    • http://sbkf.org/files/files/51692543630.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/9443879015.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707c5b98b18---xurugumefelonutabojolu.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/16230540541.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/67856438895.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/tewuloguxagifevowi.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160758811eeed9---44261475786.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d13be517ca1d47b9b34b00f1384a33f3/lodoxew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad91cdfba---35265964246.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/pesolovoxa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb6c9d53b---46118133397.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/megututulavirex.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b5d5df72---gomuwadimumu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c6d805205395bc3e5e28979f1850ae74/majuserinijives.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/52703515909.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ce44565986771fd141b90fc98a4110ba/42596095367.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bc6519aa---kezonitepoketeboji.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/lilojalidodokixabufonoki.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vizutavugokuxozagedofexu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f271071c5d---zafewikevikatixajotux.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac1ea9603---53031435476.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_off00019b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B386 11000 bytes
SHA-256: 3a6023ca63adb71b97b7bb71090ead528a06a71b87adf538419edfe4803a299a
font_02_sfnt_off0001ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCF4 19404 bytes
SHA-256: bffa6640e399c00de3721589cd3c6eeaac62b15a06e12cf92a5e5b9d684e25a5

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