Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f140331aa97f0d…

MALICIOUS

PDF

78.6 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: a0a7aae8f25233bc25a0da9ce9ccbca5 SHA-1: b231921adec3fcda48e938f9552b7f09f118a277 SHA-256: 32f140331aa97f0d0a8463b4819c2169481024cc993a5339531dac9046afaf2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure to host malicious files or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.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://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_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
font_02_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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