Malicious PDF — malware analysis report

Static analysis result for SHA-256 e536860728b33041…

MALICIOUS

PDF

93.7 KB Created: 2021-09-01 00:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c080a040f6ad62759571ddbccc692623 SHA-1: 962ad1aa7656427cb46b0e2d3ed45c4724a5ed84 SHA-256: e536860728b33041559013544e6b503f407098d3b3e5dd267b2a9ecc38e941dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://crewmak.ru/uplcv?utm_term=is+a+spiral+fracture+worse+than+a+break PDF link annotation
    • https://numberonerevolution.it/file/31188802388.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41870137415.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02c5e9a7d---bapixedadiloxi.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/13630359681.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/47541220876.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9f0aa90760b76353d2b51bd3f4c740a8/bewimivebigoguzoxija.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607063301dd3b---wofetozof.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/toxinemoro.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/tajubejerirakoro.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e66f41a1c---vegobajatag.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/7113164180.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c11062eabbc---loviwig.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/gewikorisorugoxutinobasor.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/julaligaxerijikal.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/26803c4e73159c61b8caee1ed05073ee/litofuvur.pdfIn PDF document text
    • http://medrea.ru/upload/files/xubuxolaxalabatomezes.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/80532954852.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a226c6fd---mogesozirarogizepugaro.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/norolidibosapejupa.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/98695378540.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/jetodutosu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95982b6c13---82037128581.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/77169734244.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j196qt2kdtkhfvr0lf79h8phv3/79910449521.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2ed1f694---28970950454.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/723152b99d5a66241c8997714ade9b0e/zewafip.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_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 10948 bytes
SHA-256: 6c1ab73561e3ededee340c675ab67d5e9a2d31d3ca5d6adb4ce53fa1772b07b8
font_01_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 17636 bytes
SHA-256: eb9a712a72ae0f8a2c7f52439d573d24862a58c32492303936f9e13ef6494d20

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