Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40d570eba327af7…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 07:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 94ae3bde7abfaca1bf25e189622e3641 SHA-1: 67a5907af5b4df8e24ea5ab2b44570abddf523d3 SHA-256: e40d570eba327af70a43059841b0a0b886bb45af211635c39054fcd5d054bfe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=orangutan+mother+and+baby+relationship PDF link annotation
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/766425bcdab085116c9a9a234cffcc22/36014651363.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ae0d56a7---suwufifujotudejele.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/13820221495.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbe1b43964---53634644679.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nufudekegejiwixumajux.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/buxifiwoxabaliligevulefa.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6024e3936---70361625554.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/99843451003.pdfIn PDF document text
    • https://taperagi.com/contents//files/68809879106.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/4hl5c99g6nv4jq3hnai2msed6h/37355670792.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a61a7de9---libamor.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/fc2b1ce9eb93e9951dfe9cb18e642d63/fudupofabefobomikaruvamev.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089714b55e8d---sorevimepi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/fijaxonojiwobuzogaza.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/64c720ead592628c8880b49a5715aff2/260836825.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d50658daedd5bde60a761113ff1b7e0e/xaluvubunas.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082303183955---3997447257.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a78cbda9---doguvetobonujan.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/tetitekulakubebeximozoku.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/45906251279.pdfIn PDF document text
    • http://dnepropress.net/files/file/panazulozipafipixoj.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2ebaa544c020c58210dbb96ea21ef385/94087368129.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/37374974959.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dd6a0bfca9179db2d8a2bd82e8b81428/63551230593.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab609bbb51---kosetejatulojevor.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082683509f70---bofesadofofelatirupoguk.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 11220 bytes
SHA-256: 1229e1874b577b6ef4ee2e764b45cb2f4ce58ca4a43cb21edbe9b65b117df439
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 16748 bytes
SHA-256: 2cbc2faca77ec5c62aee7ace30836957db426fdb46aebc9a1e226e1a9b423f8b
font_02_sfnt_off00013929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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