Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11dcbf20217cbe…

MALICIOUS

PDF

80.1 KB Created: 2021-11-12 00:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 170b65d2a750856d3c257604d545baf9 SHA-1: 30f9ff75d6df92b9d895d67e1c79154bdad34f31 SHA-256: 8b11dcbf20217cbe0766d410b2831da798e4197188e364f4d89162d0fd841c0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a potential distribution or hosting mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gachmenminhchien.com/media/ftp/file/medeb.pdf In PDF document text
    • https://birotex.rs/images/files/bogum.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/dexerofaxa.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20211151210502233.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/goregederelo.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/2711549404.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/totivutewititobemoz.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/10510984933.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8ccf7e7845a7ffbe97fc31a2780c3ea8/35611706272.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/giwolun.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/64345202834.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/tetasurujowa.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/lofegenokipironilef.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161441d10d1dc1---20352260709.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161817b7b955ac---vekukimajal.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/legovenujevulot.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gd6ihdr37ebec46jtenvr9bg9m/kewamudaniranezewog.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911133629.pdfIn PDF document text
    • http://berbun.com/user_img/file/kabedipajodedibe.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/putojavegegil.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/wimezoriwijaxadatagi.pdfIn PDF document text
    • http://chinahongji.com/d/files/zevazonaki.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/8894657620.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/85668153417.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=how+to+reply+to+what%27s+going+onPDF 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_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 10756 bytes
SHA-256: 492a45b37556d532b69985da7ad8d6a25ee1eb5fc1b01ba715a4d4cb7d9124a5
font_02_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 18896 bytes
SHA-256: d6ecf4550085dfa217495728315dca2dfbd6469ff7c1b0acb1e952059b04538b

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