Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebef47da2db7ae3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 09:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d9b8c17e84766f7d6839cd1e1aa6e79 SHA-1: eaaf43c786595bbeab969543f556d979ad624bf5 SHA-256: 4ebef47da2db7ae3ba8132ef83b0acd7a67e8c6caf60c4ae2ae4f8d469bd6c8e
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

Heuristics 5

  • 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
  • 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.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf93cf3db9---50165653401.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hqep27jl9vg4gv8jo7k0e5iffg/43013242830.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/63163202954.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6610dccb86---36407304512.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/jogukawi.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/79397163824.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c49cf506de---53095971332.pdfIn PDF document text
    • https://aspirans.com/files/file/bagipejawiwuvivoj.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/abaefea24185f9dc895f685452fcad13/94346581382.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mvh8j9lvh0ra325g0dgfvbded2/46969217675.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3440708e---linakipijakidofagi.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/faxobigojevog.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1fbdaeee7ee63ea693e01ac38c17e738/44138335050.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/42950987580.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/62628584751.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jusoxetolep.pdfIn PDF document text
    • https://windscrm.net/files/file/pirusowavukozerotifo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9fb9eb116---24237919266.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/4166585193.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19195f3149---68993764312.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52601858485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tingling+in+my+left+handPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 10488 bytes
SHA-256: 049635ed899f5339ca1b4783f9c78dbed043e79dd6518929cd32659ef413fd6a
font_01_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 16264 bytes
SHA-256: ae7162dc513720b7ba37e916a35cfbdb5215c3e0fb3f0d746e73345320400252

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