Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4921198616de30…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 09:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10001dedf07dcf5e6eee281db66bfd80 SHA-1: d629e9d9b31398d164c65cd4dcfa3ad2d6a7cc4e SHA-256: fa4921198616de30e0019719855af9866cb1873beaa975b9e1ce4773fc864a0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://maketmaster.ru/admin/ckfinder/userfiles/files/21867058829.pdf In PDF document text
    • http://bighost.vn/uploads/userfiles/file/2596602959.pdfIn PDF document text
    • http://hanauhrova.cz/files/kuweguperavasegamozes.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kezilajuw.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kisibawubikajanafer.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912a040bb0---36554356654.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/domekutajinunuxofaf.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/44279319247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c22c24eea---tewogi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a62af72203a---rawasujopovixebor.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/83463646096.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/divifatokozexa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608528c5e8d14---58555858393.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/91607420832.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/xovutakilazolaxenasizema.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/25384965581.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/bapijemunu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zoluroforutagubasiz.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/81541967816.pdfIn PDF document text
    • http://newmob.it/userfiles/files/dadegavalalafeg.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/92269368411.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/24610565113.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/77609544269.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111c85b62246---tamexozizatabalural.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/61569329562.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/kujurugebuxele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=shahryar+and+scheherazade+pdfPDF 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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 10608 bytes
SHA-256: b4508642de1e1aa1f9bca8cea0a5755b9d614ede5f73ee3dc155191cefdbc4e0
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 22204 bytes
SHA-256: 4952a94adc7ad1fb6506c03144f420bf126d44a65d12ed47a83240d226a377c1
font_02_sfnt_off000137ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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