Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5c6bfef0bdb7f2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 14:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f67d787b77d450a206cb8c943541f780 SHA-1: da86d7af1be92c2d0950dda15d3b2a5b0a7ef036 SHA-256: 6b5c6bfef0bdb7f22036d1db99c3bcf471ee1f6d3558086e0ad7d2db9d586038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The embedded URLs point to various compromised websites and link farms, suggesting an effort to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=the+monkey%27s+paw+play+pdf PDF link annotation
    • http://arabstina.com/ckfinder/userfiles/files/32393402129.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/23220308030.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/pemavonetexunibebise.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/kafugebavezofifi.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/99200082095.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/fuwiwe.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zerifuxibetad.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/55ac5abe76591d85084f4860737594ca/42026806699.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091203270624.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/fexotosij.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/71396454785.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/29933600600.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xazezesagejogamudibikozig.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/54046876883.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/ranamezamifofuxitujuxon.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/6835871288.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/nakibisivedunumaladoxu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/434ba25bc2a7271a608ca1ac90cbcb4c/kizata.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/fekiredatomegoj.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/xumazofogatap.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/38591499684.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/dalat.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/rorasusutasiralek.pdfIn PDF document text
    • http://arsvet.ru/img/upload/siwilazunimevulokogofude.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161308d4538afa---taxugudowovotedozovud.pdfIn PDF document text
    • 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 10764 bytes
SHA-256: cca3ecf044910e55a73f3813d131641c8fc7792a4d3a073871565fd14d0f651c
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 17436 bytes
SHA-256: 9d02d15528c3894e44dc6ae388a0aceb3c92b94b9d3b90cce5596b31b675f2b5

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