Malicious PDF — malware analysis report

Static analysis result for SHA-256 85132c9b2054eeb6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 19:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e5f373c2c38a25c6e26ec0fa1349f0c SHA-1: 60fc181d27856504f7e03a8043904fca2dd4b81e SHA-256: 85132c9b2054eeb62651e9399bcca69308ff10efe880fc64889f131a991e2bed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to WordPress sites utilizing form upload plugins, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=past+tense+simple+and+continuous+exercises+pdf PDF link annotation
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf86fbbb02---vasegokuxupagov.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a816cf264f5---zinirunoboduzajevi.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/pafonekilesozu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf416b176---57115580505.pdfIn PDF document text
    • http://bienbao.org/uploads/files/56340265201.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jexeleradimetogo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca01b5b585948b0a7baa90f62efa102e/pufutod.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/wobibobivuwedib.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b01c8751eadf7cff36e810a26ac6bb43/kogojemekowuxukoker.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4652ac1a6---jixowamupuxeboxujemil.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/biturav.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/witudigori.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/92412896817.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608023a8085ba---demedevexage.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/03176719f99962209d0bb6c001d17b83/bunopa.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/gulasoduwijajazeteradim.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/91059789894.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/84581857878.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/zelarusuxazafurusurokufe.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/184abe80152538c82b34e951b36d90d5/vemelu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f31679385---70632186533.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c3966f44---lobisefisoku.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 18140 bytes
SHA-256: 27cb7e5b14bed2d18d4280d524b8e5fa80d7cdb0e68e06d9efe8a9f6915fb157
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 10984 bytes
SHA-256: e25e0354d8f9a98694b354cd267f4a2fb6d684e0db46262fe235ca49449b9d61
font_02_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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