Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3e495163508464…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 17:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 244e8d968e2268da8f476dd02072cdca SHA-1: 061f536831aec76aad53bf501e0bb951a2e968cb SHA-256: 1d3e4951635084643d7650c16c1ad360e442c365f807e0d78d3f5bba3f92b35a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of many external links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://catamma.ru/uplcv?utm_term=college+board+sat+physics+pdf PDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xewobotidajomuna.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/snl3mn6o4pcee9k42mc0pusehe/muredisuferunebakulo.pdfIn PDF document text
    • http://aplus.to/userfiles/file/xazif.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/xoparaxirifirixejar.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90ff21f770---10861169752.pdfIn PDF document text
    • http://contextuae.com/resimler/files/fazabuxuzeko.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/wowosetewojumikurezaroto.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cdd282ee2---66779489317.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6dd153709---melovabimuzepiwixopabosuz.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210527161829164.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8e84c883---toworesugogotegu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/44885394583.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/97886905333.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/jamegur.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/zukodogufiparadijewakasin.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af4409e5230---mozawujabazotikezalob.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/apqdkiamtroei5ftqks8617iv4/79442661596.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/43c9ce4e200760b8e939da769a07fa59/16555083958.pdfIn PDF document text
    • https://siroyensao.com/upload/files/kupokijawejopomevusup.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/totavoduxigiwox.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/joxezixu.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/bikofawa.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/99043937569.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/sopojojexebimejibumo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a38b12643---xemugekubejoforasosoni.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b165dc9fd25---dotatu.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 17796 bytes
SHA-256: 6ffdc5f658ac6929d3c0863ceaf9b39f1181f12f9daefcffa142ed29312cc643
font_01_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 11080 bytes
SHA-256: 235ddfccc4cafb927698931b8d63c171ef25fe55051c4010a263db0e406f4720
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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