Malicious PDF — malware analysis report

Static analysis result for SHA-256 c250695d1eb8969c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 00:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99f7c730c8646b73f5ec0aa403ae694d SHA-1: a080c8bbbb21fc2821223f145f7305f53cc6c553 SHA-256: c250695d1eb8969c170a8612e50e9b1f3cd720e716f5c1e3883f9af9ae30239d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm designed to direct users to malicious content, with several URLs pointing to compromised CMS uploads and disposable hosting. The presence of a 'download button' lure and a high ML classifier score further support its malicious nature. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/rijc9bouo0sc4540r8ua9bt3tv/xonovikapovivopojul.pdf In PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/89239990981.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/guxokujefavawinegakegoro.pdfIn PDF document text
    • https://coevent.ru/upload/files/61450287272.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210805051417.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/gurawo.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/xudujojexodorabafezo.pdfIn PDF document text
    • http://ranchobg.com/img/file/92559834938.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/dudetaziwilimabokive.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/32420646646.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/nalabidepel.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210730_021817.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8jkr1p2e388dvm9kpigiceaon8/78163376696.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/zafizikozewuxelaxa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607161fde7433---jebilekofaluvivuruxeki.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/23072389517.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/4951759332.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072309ae960c---moxexelisufo.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/dugalu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/513e0a952385b2ca2443d2c6385e8691/30928148399.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/zewaku.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/843fc6eaa2c8d866e0ccb1c4f1d50c5b/87428702155.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661bbc3d17---noberaliru.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b8d15e3f674d0a185a92d74068a5d550/62024160506.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161032503c593d---didigesafalebofipuboke.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea5433af7---68971889265.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/41872851496.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c373a6d676---91278116130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=new+headway+beginner+4th+edition+pdf+free+downloadPDF 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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 20668 bytes
SHA-256: 249a3d3bef9c6f1302e759bae4d81285ea922d1a7cdc2d0f32f57a49d2ab5f23
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 11004 bytes
SHA-256: 1880bd5be23ac272cecc41b78f1265ef26fb5e8205470a6d4ec4db55a566ff78

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