Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29fbaf0860f8503…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 01:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6746b6e8b4bad0347d6ef9db76567cf SHA-1: 8fb26ecdc07ee66f41316cc82b5f57a455823559 SHA-256: e29fbaf0860f8503392513b93f138afdeb9745a8f064715285c9577fe3a13152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=symantec+endpoint+protection+manager+manual+definition+update PDF link annotation
    • http://loveperfectionschool.com/upload/file/89672733531.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/950af6930c991230ef134c82f27114f6/rujeduwajemis.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/ziwemijetaxagev.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/j0pbeqfvg3ees4q3ed2tj9cm1q/refonoxagonufaxitox.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/xujuri.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/mevisafaporudigoroxeziwoz.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/vesugotokari.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/sutamapifesesudo.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/dewinivakefexujurafum.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/rutede.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e311d329483---subowi.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/27425665133.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/vosadosewunive.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210707_C833079F5D732420.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65318608e4---xinimaxaxudenovisetil.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/zamejuk.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7a987efc---bofezezexaxu.pdfIn PDF document text
    • https://saam.vn/images/content/file/17068482244.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec993453624---12386183512.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f29ce9f6dc0acf407d388ec363b0f3ee/51719613129.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/10751e50b89f04bb2938168f76f67ad9/57152783030.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/13843311468.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a611cbd6771---12196734152.pdfIn PDF document text
    • https://landi-bg.com/images/file/doxogikumojikunijezowibim.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609212f1ef938---wawudurudas.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 17160 bytes
SHA-256: 90f7f640e438ba01142a8340b9957bab605f9e53137cc9dbf086412a554a6be7
font_01_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 11084 bytes
SHA-256: 902e31bbea14045e4c74c62e5ba1bb7a7a1d80a716328476b14d08ba7eb23f19
font_02_sfnt_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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