Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cfe74689296328…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 13:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35d35ec1e3fcd5fca9099cdf3d3d5c18 SHA-1: b22247867d0b250e110760692a2de579a0545859 SHA-256: 84cfe74689296328789c69ceceed276af934c53c45b6645da3f04e9fdbfc1a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on compromised WordPress upload storage, indicating a phishing or malware distribution attempt. Several heuristics, including PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, confirm this behavior. The ML classifier and ClamAV also flagged the file as malicious, supporting the assessment of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f0eb872d---negototebojoxofubage.pdf In PDF document text
    • http://mikllc.mn/uploads/files/kudazixuxepudusaza.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zekuwepujuvegaxowedat.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcd6cf432---luliribagisilagu.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/38923736974.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/60932403304.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/27171240617.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/nuzuja.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tevorowolufe.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedecced89---79755197045.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/74177982227.pdfIn PDF document text
    • http://dzbnf.com/upload/file///33383428141.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79930296271.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/naxukejajadilototasig.pdfIn PDF document text
    • https://masukpt1.com/contents/files/terobevanelevite.pdfIn PDF document text
    • https://mavibusiness.it/file/zidud.pdfIn PDF document text
    • http://parilka.by/var/upload/file/lagewuz.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/81820999234.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/dujexezaketuj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s0t88r34vcq334vddei4idvet4/fison.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161347b389b053---furadapurojefur.pdfIn PDF document text
    • https://citrasas.com/userfiles/file/mugusow.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/kevabev.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/94739761578.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/vololi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=original+vidmate+app+linkPDF 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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 10632 bytes
SHA-256: c7c4b71f2aad9970179d23ca590d13194de02abfaadbdc35a0bad4f4b84f581d
font_02_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 18184 bytes
SHA-256: 073cdf53fa10ceb44cc16dcfa0c31e1ffeba7c1eab0260757c1db86937cd4041

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