Malicious PDF — malware analysis report

Static analysis result for SHA-256 db053928cc5d5dd9…

MALICIOUS

PDF

93.4 KB Created: 2021-07-07 09:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0954d36724f09eae8f6249d27281949 SHA-1: 0d70093a76b43673e5278fb6e83724e9f1d27e20 SHA-256: db053928cc5d5dd9c035b77e971600ab912b3d893933e87cc932c3d9aa6d14c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to compromised or disposable hosting, suggesting a link farm intended for SEO manipulation or to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and link farm heuristic indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://www.sport-konyv.hu/userfiles/file/21962173337.pdf In PDF document text
    • http://magogaralbamoble.com/galeria/files/82256313420.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/pawoturewurupapasomuni.pdfIn PDF document text
    • http://berbun.com/user_img/file/xoburezesozelewogikewo.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5f9d8bddadf75b9cda548ea4c98c6770/8624713648.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/64575993541.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jarezefiti.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ut8h7ep64f5r0a0fj7ulim0meu/58598658591.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/givitipapirufevisizopod.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/nixifowuvemazod.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/92ca98dc0d57a84dfcdfe55062a2d3a9/80839302820.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fece251ed4---87526453931.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075161b86397---68836183669.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/52398049757.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/73979444090.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9efba58353630215bb2e9ebe72c8b551/24774684444.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099218b79a40---diwozaza.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a59f60651---dujipevirakuvav.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11fd8a97a---52195983963.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5do8l0go2dmbevk6r6kk9ckqo3/jezugorirumigebo.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/duzugeluke.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5dcedea1---tusabetidezeduwul.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/kewosilaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=grovel+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012f32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F32 19252 bytes
SHA-256: 06fadcb3c7a671b9db3208d3ca2d9c2106f970fa4bdc0cf499710c68423122f2
font_00_sfnt_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 3052 bytes
SHA-256: 55e7a3ef06d24a8be81bb74724009b09cddc8b7c90826ce85bc1907479d1dba2
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 22320 bytes
SHA-256: 56751a071f3ffe9aecd6c60f035165bb5fc8b607cad2b76142322cf20e8a738e
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 10560 bytes
SHA-256: f6d993045edf2a871d4ab1967df69bab80ec3350813bf22f8ce64cf4888afbcd
font_04_sfnt_off00014dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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