Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceff5cb96554cf27…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 20:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e102082dcd96c06f10e64dbec4064c2b SHA-1: 75de9c87e570119d911758f4c606ce3004019f0f SHA-256: ceff5cb96554cf275fb225e4c3fc62789f036c970e0b7fe1c1e767ecfa8e1360
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c1864cbb1fafc48854353baba0319ff8/pumipag.pdf In PDF document text
    • http://guowangcable.com/d/files/71646608082.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/23067008816.pdfIn PDF document text
    • http://djapm.com/userfiles/file/66198349892.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162545776538.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/90686734604.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0af0d8b7db---basefeta.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4e656825c---55312294056.pdfIn PDF document text
    • http://poliinc.com/upload/files/6641360370.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/73671403579.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///vovokiraduwunituwotezadu.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210729230036_66z55j.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/42455741217.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1041387399.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/77473534421.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/menadufadupetujolekupopuj.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ecb407b16f6fa7a661669c2a226f6734/ledapatizub.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c08e709af9---67704672198.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0e3dfb5d8c918e4dc44d08bd65043b4d/57383480941.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/85170137521.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc71801e7---vuwapipikiluwaxolo.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/nigitodamekejerawapoturon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=algebra+exponent+worksheetPDF 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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 16788 bytes
SHA-256: fae3cc9de22fcfdeb39bcf2ff3f42cdb1fb8e9e0d5f8c71507435928526f9f60
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 10840 bytes
SHA-256: 947faec8eb0b19b144e7ba6a8a371dca19ea1d45019c5c43b0162808955ff425
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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