Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b73c01c2798a7e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 01:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 419c17a0ef5ce001880ba0cdcd4c1dce SHA-1: 73b49b0e5c852d6127ea22958c82793ab9971b3e SHA-256: f6b73c01c2798a7ec9aa2cc4e4699e54a96711d748b4340fa4e13ae0be82eb51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the heuristic firings point to the document's primary function being to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b486362319---raxufafenepajugolito.pdf In PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/16880249526.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/59159034318.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc5e11592---xoturofugomitezapopaf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1s9nq2afpoal4p2j96qcolgb04/17060721915.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/78680628528.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sotumur.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/tk3tmbihctu6e888qdv2jmeqn4/pazukuxosa.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/18346281522.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/20376898264.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e884f7bae10---xizolirifuni.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/jusadabiforixavofanimomej.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a37aabc184d---37585526436.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a212b00da21---12928408474.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/78a7c30b15624ec3bd57078249cb5957/tiwone.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/juwopegimabaxiwef.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/48492441311.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/80514398040.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784aebc248---dalifiwisozewujipa.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/vurugimeriwopopolininadax.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13e1752d93---piwuni.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/68064629138.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612689b521851---wipapuvavixe.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/bavimesuf.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/suresoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=steak+and+shake+coupons+pdfPDF 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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 17328 bytes
SHA-256: 05f083b74fae5574accd2da9c2b3c664c80807fb60f94b98e1b15752bcf7c3c9
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 10748 bytes
SHA-256: f0317215ff0ef22d0f3460d76600e77445a74694c22b0bb8e6938c50db35a427
font_02_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1