Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ee13641f3948bd…

MALICIOUS

PDF

74.0 KB Created: 2021-09-12 12:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69b0d9be3d357fb581d1cd518feedfe7 SHA-1: e5b357e166b35d1bddcd74c116c218d68090acd6 SHA-256: e3ee13641f3948bd2e01edecceeab4f0b6a5eeaeff2468576021a4ad2639e89b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yarpaket.ru/userfiles/file/90493982253.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0df862ebe---napafipavevabinikin.pdfIn PDF document text
    • http://skupka23.ru/upload/m/94633243404.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qtbtqtjc0sg5rjdpf56ib0f4bv/gefitivifugivuvifapaledux.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/kemesonobeniwekalawipo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8812299112.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcee413c58---gaxepuratizotuj.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4b6887f7---xoximosiguv.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/41096768663.pdfIn PDF document text
    • http://pronobile.com/catalog/file/81214334864.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/64245259022.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/tuguvix.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343af70a91a---lorixetupevatipibas.pdfIn PDF document text
    • https://tavio.ru/files/file/73749283068.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/no3ckp80j8laqn1p1ebh0s0ok1/dibagikopalobe.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/rerurapeji.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/4108103844.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/44065924976.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/44903670870.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/zogudu.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/51809990141.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3ed11bf6---zogoroxosutofor.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41c8e7880---pawomuwowukifufesosutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=has+leaked+window+com+android+internal+policy+impl+phonewindow+decorviewPDF 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_off0000bb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 11128 bytes
SHA-256: d306b174b1edd9de8fc3deaf98bef1cf445423e87b66d0ea121057fc255eb275
font_01_sfnt_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 17400 bytes
SHA-256: 9563c4ee95d60107e42ff5e5c94d34e1e7057b613990cef2a65e1182b172ec57

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