Malicious PDF — malware analysis report

Static analysis result for SHA-256 35142d642e1f669c…

MALICIOUS

PDF

90.6 KB Created: 2021-07-05 13:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef6efac844ce091842f6d9aceeaa65fa SHA-1: 0ade929f23a44eb052a5374668253b17f692e5be SHA-256: 35142d642e1f669c4fe6902dfb232005cca756f31d42a5557d3a0e5f69ef913c
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, with numerous URLs pointing to compromised or disposable hosting domains. These links likely serve to distribute further malware or engage in phishing activities. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/555cc5452c97729fda76af89705106a3/zegofazokulisu.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b2307f767ffba524536eec64309af12d/bopejonubixijisemamipuxes.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zokalisuredife.pdfIn PDF document text
    • https://go2germany.ru/files/file/94713629821.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/mitut.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624481258.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fd9c3fe58c609115b86812dec016b670/diwudakitesizikop.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5373ac17e---jipikefefavafoxilusizup.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa755d859---14400606572.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/20535310577.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d890a3985f---31578413114.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092db19db26c---19026729426.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/47664888280.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jipumadutalagemiwunomekev.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81becb351---jufixujijukuluzufira.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2418c68325---zizola.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452cc9c282---niwadedobozufes.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee82ebc1f---92120724327.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tebuwukibuparufinisu.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/bujasofawu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ghb0ajv5enark9o2s9e0qpf5o7/pabonirosonabo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/92517544434.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/51581883914.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e71905ee6597ad770843c4eb08a8a07/92678871558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=causes+of+external+vaginal+itchingPDF 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_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 17064 bytes
SHA-256: b9ba331a5d5378f18aa35626e6a390e7fdbec97a92ac53ca794e8a02bcddf404
font_01_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14393 10912 bytes
SHA-256: 2bf89839bc5cc9f0308ba6ce86479b0dca4cc36e65623d65c3dd60f4411064c1

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