Malicious PDF — malware analysis report

Static analysis result for SHA-256 599de5a3a101932f…

MALICIOUS

PDF

93.8 KB Created: 2021-09-03 10:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0a7177317ef292ee0bb883398c0de6a SHA-1: e865ea89d571ce7b355f2717bcd07e77e6f46530 SHA-256: 599de5a3a101932f3521d532bfbf2ec2c4bbb9725310645411696f0f6509a740
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves exploiting user trust through a malicious document to lead them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://campfirewtx.org/userfiles/file/49591799002.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684a727f22---ribuwadagodavobilozikijet.pdfIn PDF document text
    • https://songhong.info/userfiles/file/92585565494.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/22973673350.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ac5ba0d8c0d9ed52799b6921a97a6838/vixivutixapi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160af3d02d62eb---58986455762.pdfIn PDF document text
    • https://tappowine.com/file/32336961759.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jilekisekarijotexabijib.pdfIn PDF document text
    • https://j26clean.com/upload/files/lozejojetap.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/venamejuragaletagowuzoma.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/82010f.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160846d08a2b98---6092658134.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/xivomipin.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109c0bfeb6d3---sepagepozumemeluna.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/volelolitonu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1f92aaa13ad9d4ac54d6707eabfdac0a/nanozegoxomofegorawojuki.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f009e6701---ravumiwe.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/4913399197.pdfIn PDF document text
    • http://mylodge-naoshima.com/josagotuzumexokowewi.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/xiverovoj.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/talazowitedigafira.pdfIn PDF document text
    • https://ocw.tw/uploads/files/63898861831.pdfIn PDF document text
    • https://ferropula.hr/files/86932774021.pdfIn PDF document text
    • http://muszempilla.com/files/file/rawanulonusepaxepovami.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80cf2b168---13075995246.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b00eed5c6d7294caa426e6ce8f8579cf/nivawuvilavadubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=causas+de+iatrogenia+pdfPDF 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_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10760 bytes
SHA-256: 944bc583c76ec13b72afb099c0905e7940efa0c1e24ac0e7802935f64fda990d
font_01_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 20648 bytes
SHA-256: 24b46ad7b4a778e5409372c1b785e1cc66aeb8fcc5446f9d4600845c7f14851d
font_02_sfnt_off00014feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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