Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8066a59486869bf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 02:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cb1f3b8f7a1d015b09939056125495e SHA-1: 47116e5076556892b9e93542c2cd7c48b103d34a SHA-256: b8066a59486869bfcd4b68e1819c4fca1f477a10c46d8bd775376269afb80cf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The primary attack pattern involves luring users to these external resources, which likely host phishing content or serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://castilloexterior.net/ckfinder/userfiles/files/68665065853.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/dlk6rdask8mnedk60p5ed1k791/79051519307.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6a988fb4a921d6b349dfa34234565cba/dagatinu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ea11aae0---50891042442.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210826_7F01F03B2A68ECCE.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/85973825093.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d76bb71d1---gapogu.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/84722275902.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f900eb80b8b16973911f9cdb23bef1f5/79725477947.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/18514524924.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3091b2120289edd9625ec87f5a36d1f3/serixebere.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/74b95da7235a93cd3b80827faef0223b/85722554350.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efc3672b7---serefolekizirijurinuw.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/fixeregadizojo.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/linagexexafupawafuxelun.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/3809f73f46419891e9986336eb2784f3/mibafifasalisugirenod.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/divogerom.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/nerifagupatunofew.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/8c809dadc253de5b9a505e5cf9bf56e9/84965186695.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a2s7kva0n6jbt6copq1b18aa8r/sodoba.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/buzijemezed.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/87139108426.pdfIn PDF document text
    • https://roc.mn/uploads/files/73351434033.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/75267857078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bionaire+tower+heater+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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 17720 bytes
SHA-256: 137b90505de7a9b31940f5664c7027ff7831b7b76185647ff77b025ebb1b7dc6
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 10444 bytes
SHA-256: d252ddd0e782174e1cda2bc6d541b96291f9ab150f33102beea889b4080e8dcb
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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