Malicious PDF — malware analysis report

Static analysis result for SHA-256 752cb1b82a615e16…

MALICIOUS

PDF

78.4 KB Created: 2021-07-06 10:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2e568e5e71393407dc07fb6aa1fb827 SHA-1: 10556e5270532f569e665c77833f9e6d2de92493 SHA-256: 752cb1b82a615e1653638e9ea6276a4c17abed7c94d8b99515e684f45802e68e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to lead users to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=cold+stone+short+pump PDF link annotation
    • http://tylincms.com/userfiles/files/papuximokutelorezesiviker.pdfIn PDF document text
    • https://pmms-online.com/assets/file/40905585617.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11840d64a---8162245547.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/98ca623a9a2a58c9a0ae12f26f4f8247/zoketilefusedux.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/ximilaxegelaz.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/vijakifetobaboxasuxuj.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d3ecbb98---80576765167.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ec8fb68fa50cd64d98a3741fd8f68bb0/kasetizowelofu.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/jarenozorisafe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a17eebfd---latufufaxarer.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2dc6fa277d9e84bbc4e194851e57fc72/gonididakezeku.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5b10e9a15720245c6ab98f46e610ea34/74308509488.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nobarodaxurulamavizor.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/65462473862.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2425e83e19e0a1930d9d2a3b53782ecb/vivubepikosir.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210626044602201.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/74726683952.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a444b3fc---pabikeposulazetimedida.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/juxakekuwajivegasova.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43583843d---gifud.pdfIn PDF document text
    • http://webbuilders.com/files/file/52891908477.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/gusewuzuzewewovavop.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_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 10532 bytes
SHA-256: b56568acbff4f434f36c1214dbf7af3ab5fe8b4336653c2fb237a89bdccb3f7d
font_01_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 17172 bytes
SHA-256: 7e8148166997b4ba5bcea5e47247e4f1b771e3626f63a080182fe7d6467951ad
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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