Malicious PDF — malware analysis report

Static analysis result for SHA-256 a510a6210ff1070e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 11:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f3d9c446833f64e8d2bf3fcf287feed SHA-1: 2c030874f23dca1aa208f5b6a609e167016f9967 SHA-256: a510a6210ff1070e8f8f96f4d5ae1990fec95eb06eb761dd32f88f2e0c471a28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains, likely intended to lure users to malicious content. The presence of external URIs and link farm indicators suggests an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://fonnepal.org/userfiles/file/55659455106.pdf In PDF document text
    • http://aristosaigonhotel.vn/uploads/files/57489462417.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914142834.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109042316344646.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/37988961113.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/cb8b27a727ce0fc3b69e103a5f4502e0/xasela.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68aocgio5ljlvlsmqc2frhn8jn/52086054476.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/62097575363.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/lufovetokejubinojexoge.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/mokufuta.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/71479402794.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903205403.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/luzutem.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/99203323953.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/985310bf91b18d776848a2638f48ac3d/tusibubomixuriwi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7163a795---xedopoxosesesajerinezuv.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/fijeko.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/78568173255.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/36446718529.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/zifazep.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/70572567169.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/temelu.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15680273413.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/49228005721.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/gifefizunojesurumodafid.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/71154080854.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/17727393612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=area+of+semicircle+formula+in+mathsPDF 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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 10680 bytes
SHA-256: 78578b05188423549cd263810637ef932d2ea74869eea3445c77b17f0ed19336
font_02_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 16568 bytes
SHA-256: 95f9299c116c9d48b32240cf75c1b3ebdc6be2d2127296c6cab92855d4626323

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