Malicious PDF — malware analysis report

Static analysis result for SHA-256 376682ad1317b0db…

MALICIOUS

PDF

71.5 KB Created: 2021-10-03 17:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1790c629d4719958d367c9fc65ef1406 SHA-1: 327d39e48b611c9439db8166af5a891c2e416979 SHA-256: 376682ad1317b0dbd75afac02d547d221d74b51ea6c52851733ec1ef346fa9e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=fahrenheit+451+part+2+words+in+context+vocabulary+sentences+answers PDF link annotation
    • http://babijie.com/upload_fck/file/2021-10-2/20211002221527462831.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/pukax.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4259155e---mujivikijogoriru.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/1128053911.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630710479580325184.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210919_AA710279C79A3215.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/56826880389.pdfIn PDF document text
    • http://svx.su/ffile/file/polonob.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/44425398160.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/tobilozu.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/giwaza.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/29719124890.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/86603653778.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2e83bf02---vabisem.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/48539427586.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/rapamaro.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/rejut.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/57545969354.pdfIn PDF document text
    • http://saaretravel.ee/images/file/69235462953.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/17919458521.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/xigup.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/43582404491.pdfIn PDF document text
    • http://allergyc.news-read.com/upload/files/zobapubejelijig.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/lewereramobikiju.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16156e38ccb091---watafegepeginarufulepe.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_off0000b1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AD 16984 bytes
SHA-256: 0ad0995169df63065893f3a97f8ef0944621e0172ca0ef52607c31c999567207
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 11580 bytes
SHA-256: 0fdf979515571231f6c21b02e8df4c215eeea1c81ef7dacf6c8ab63f11ba03f1

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