Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fec8c55304c732c…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 18:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e8e58d6b70437334f3566be17a5aba3 SHA-1: df44f7b178c85e4e01cbf70009b56202422ddb97 SHA-256: 9fec8c55304c732cc718d7736314079e7869c1c5c3873c76ce50bd82485a392d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://capitalsyndic.com/userfiles/file/92014616275.pdf In PDF document text
    • http://csc020.com/userfiles/file/20210623221724_ohlkmg.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae427e4aa59---meduzarate.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ee1f524616267d2436fcfe937d44f19a/nigibazimosipe.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xegopepiranidolorejetizel.pdfIn PDF document text
    • http://cwesp.biz/upload/file/2091714052.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5f9e0f2a---pelemojejeson.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/padisafi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vp5lb1emf612nuifh9v5ejcaie/27327880867.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/72150318601.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/r43dam7pjaa3gpc46s5jpcd0kg/96830897101.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d763ba5ec---sisiboza.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4c68029a---lijiwakegojagexitilovigex.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/regurewomoweto.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/zaxanugawew.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9345de14---gezekit.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/82134355917.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/bfee63c031a07d8232c1b42b782da0ae/tejidafozeliduxolixes.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/51499928254.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c292dbd0e---gixuresopaxema.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/dakud.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713d8852c6---fufowoxolis.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4681f4ccf4467fd925569caa931dc1fd/badafufid.pdfIn PDF document text
    • http://tencanpowder.com/d/files/ravixawubenunox.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d87730b4610---jegiforumuzoxaturor.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/44763949663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=unprofessional+behaviour+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 18412 bytes
SHA-256: 3c2a1a1a934dc5bed6399bbd269d152da85a7c25e0dc2219f58e086f2a9d48e0
font_02_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 11020 bytes
SHA-256: 724a6aed7db9117a4bd27d35643541e6a7d763cab038f12e3499f8ba97115e6b
font_03_sfnt_off0001498a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498A 8964 bytes
SHA-256: fb00ff1200385a7d13ba3b9d0a8bc0218550f2d1084933a15c6cf4a61ada3fdc

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