Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c36b7b0daac7a59…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 22:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76a5521748b890326a58e2edb6476a4a SHA-1: 307b8da95cffa7c3b8e666f7d9f1c682aea0b095 SHA-256: 2c36b7b0daac7a59b8c7cc29fdf99b4137db93b0d6e322dbdabe18b105712e48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and other domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://jf-orvalho.pt/userfiles/file/86094850126.pdf In PDF document text
    • http://dgjst.com/upfile/file/nurokutetuwola.pdfIn PDF document text
    • https://preciseenergygroup.com/media/ruzuvexamigepawe.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/36774921916.pdfIn PDF document text
    • http://nakatka.com/files/file/bodijosufira.pdfIn PDF document text
    • http://cjatkinson.com/userimages/kasivo.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bekiduna.pdfIn PDF document text
    • https://luminex.pl/upload/file/73824702889.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/43809703409.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b0604c8b---93052341830.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d79bbf2b8---36753314413.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd1626c92---44811021716.pdfIn PDF document text
    • http://wixoon.hu/upload/file/razileladabuwulajo.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/62670591669.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/40670420546.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/95059829201.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/jamasi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0b44d7f774d0326d1452ff196c22bf40/kugilag.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee284cbad58---92483933665.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e89c35468cd4a8f9ec5edfe82125bb90/73403540102.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/mumesukifiduluwi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3dd50443ec1b43754668da0630403184/noguzesujojowepunos.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/19432486369.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7iihnslfchplr7fi92tq5vfupk/bafixojojevazopefovofonuj.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/purawokeb.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/vizililimux.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/28474898554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=micro+motion+5700+installation+manualPDF 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_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 17180 bytes
SHA-256: 9914795087bbf0e4d44ac3e3982643de225e9ec242999f66bba2368f1697f4d7
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10656 bytes
SHA-256: 5c64fb8352a52a45aaf341f89f84c92a84039f609a456040ccb16d34c8cd835a
font_02_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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