Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc36a177f935420…

MALICIOUS

PDF

83.0 KB Created: 2021-08-22 03:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e86c4a4bee2a4f79363ef62f313e8b86 SHA-1: 4c4b10f785c68fa1e470460d7e40c5964a455a4a SHA-256: 2dc36a177f93542061f0d2e04550aac0c12ca67146462f6ca31740e33f1e0ee3
236 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The presence of heuristics indicating a 'Password-protected archive handoff' and 'MFA / one-time-code harvesting lure' strongly suggests the document's purpose is to trick users into providing credentials or MFA codes, likely after being directed to a phishing page via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://crysiq.ru/uplcv?utm_term=why+does+my+gmail+keep+saying+sign+in+failed PDF link annotation
    • http://laboratoriologos.it/userfiles/files/vapolupedogulakozap.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/raliziwinaritab.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/s67hhel3qdtaqhrdgfu2uqp38j/domamonijesoxa.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/46109567278.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd962e7facb---buzakeniwuxagozupavalifub.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ic79statg2rkoeavvk49kkrl5r/28346717878.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/16088745625.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/wapimo.pdfIn PDF document text
    • http://simoncaulkin.com/images/62838706923.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b22972476---gajobitakifusavegodip.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/zarud.pdfIn PDF document text
    • https://tigaintan.com/contents//files/35555530376.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d6da12571---mikerozelazewaraw.pdfIn PDF document text
    • https://mihalex.by/files/files/labuwapekuxudumoruzud.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/0f98aec34e34711b249f45a8a6ea32e9/6257318815.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0cc1b8d0---79456231254.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/27578966369.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b02ed5a36---regugonemilutinodoriwu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/nevilatimafilaxawesagove.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210630062655.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/xiwokumulezapebulupuwora.pdfIn PDF document text
    • http://fohow77.ru/upload/file/39055510824.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/24488869061.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10948 bytes
SHA-256: afaea8b18e980d348ef53d2c061166822b0acff415a670b1d8f21a04833b0e9a
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 18000 bytes
SHA-256: 87c4cd3353930c1d9b1c96f99147c8a58ef196c1d055f79f5d5f3592c84acfd5
font_02_sfnt_off00012554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.