Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cb671ac3f56a7d…

MALICIOUS

PDF

94.8 KB Created: 2021-09-01 13:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3afd84074e29ed6a386d1a82b285da7 SHA-1: 9f51053f93e66a37f29c3dc1e410a049cebfbc3a SHA-256: e5cb671ac3f56a7d34cb25772ccff393b0f2a8004396e8cad80263af3009d82a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://mosme.org/uploadfile/files/gufikabafawopijof.pdf In PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/71447989762.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/31016842676.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845df86a910---29328608749.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/56413842380.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/sameker.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846f3d4fc66---gewukopeburap.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wiwujunuzop.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/zelaziwidaka.pdfIn PDF document text
    • http://twilaw.com/files/files/tazev.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/31134892815.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/v0k818m4ovhq5h99bhq17hjlnn/maladazuvu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0cee812a33e635dab877ae9614fc388c/3962115683.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lulaleval.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7c52b220---18837902816.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/teviterukifirukimojemap.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/bupujumituzeb.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/viwavotifovimasafikana.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/41645388767.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/56861048399.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/givatabunojedafunemir.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd29cb9131---fawebivowisisuvejabezal.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be70669225---kapunoxolefegib.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfe528542---manisubeligo.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/zadipeponad.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af95a51a9b---vupixakavubovopipumumub.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9lnesiaplp5tmdbsi8u51hjbjn/rugivoxubemar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=anatomy+and+physiology+cardiovascular+system+notes+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_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 18924 bytes
SHA-256: 6bc92ebeb5bbdf77c82c9f5623ca62cbc7a3fe55b36b1a6bf61da7a4b709b79c
font_01_sfnt_off00013a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15285 11328 bytes
SHA-256: e8f92d7afe719bf4147ed989f6e26d250452dc30036269b7f8b62cbd316ec041

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