Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6079dd3ffac46a…

MALICIOUS

PDF

116.4 KB Created: 2021-07-07 13:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4c476adb6c3f6cda8e5cb4a6f7de0c3 SHA-1: eeab21c50cd27bb8ea65504399072b822059ad94 SHA-256: 4f6079dd3ffac46a37c01eb5e5fb9db3f776ddd409dc7f6d7c4e0c0057f387f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f9d4fe86---32637056023.pdf In PDF document text
    • http://linkingpeople.info/userfiles/file/soxipegodawupadevipe.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e397e99fc0---93166387081.pdfIn PDF document text
    • http://mesterek.net/tmp/zojozitusajoraxejefojafa.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/ruribopejiwire.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/37708181974.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/xokanamezefedapetikax.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f185b42c669b0fe11d66bf9b2ffbda77/81082816725.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/joxiwasukofopunuk.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/98327282388.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/ropuk.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add5748ea84---fiwageb.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/62538673792.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7pevs9gtma6ve3em7t9ee3enma/74045992478.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/64pbon6v9em1kodbfliug9mt5k/rajuwekivegotididezoji.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/4939534989.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f86f778ad386ba551c2880d0663b96c8/wenad.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/25559721350.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/bakizi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f266258e30---worukosirosugewefa.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/retixeraxefulururobodir.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c61989eec32dc709615a84083eda3c65/92569986499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=capacitance+of+a+parallel+plate+capacitorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D0 20700 bytes
SHA-256: 66ac1ce53b520f129df1b91d4386293b0833374860ed8da5b5163c52bc23a4f3
font_01_sfnt_off00017e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19630 10336 bytes
SHA-256: 56dd1baa7c586c9c7af4aaf7c8927e2e0254290d16ee78ed4726770c1d12e5c0
font_03_sfnt_off0001ad9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD9D 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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