Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d4d2112b132e99…

MALICIOUS

PDF

85.2 KB Created: 2021-08-19 14:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cf3a98905393b3664061c90facf3160 SHA-1: fdea9a380bbd40e5daf082d107c437c2f307c1e1 SHA-256: b3d4d2112b132e99970fe22e05cc99125875b9b752d07e5e9fa1333b4c1eaef6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to potentially compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://drafthe.ru/uplcv?utm_term=how+to+write+acknowledgement+in+college+project PDF link annotation
    • https://thuaphatlaihanoi.net/uploads/files/kamox.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/xukamopozarewulutetubat.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e98794297bf8bf8b52876a69bc8ccdb7/zidaroxozopoxolabapuvuxo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xevegukegufa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/krk8fr5c1khhqb2b5vv9aeijld/82630364815.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jumopikasop.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/7qlcehgi6nqsggabm6l1h7m6j3/kanasideti.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccaec4647e---sebosolopelikekevivib.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e5dee419252a5051ecdc800ae743a9b8/rojilawalixukobe.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/pulipuwekajozaxosimemoma.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/larikikebapujosage.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab1874d6053b0af215c1b87ac98628e4/wupivavixovovusako.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d103541d61b4b86b32138939b69ef0bd/82484633200.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba34e149c58---76088062195.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b4a77fcce---juzajugurudiwitawikexigem.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6hcsj6e6a5g31lt2ftmu231f6r/79110828045.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1ce5ba5c9---97599585610.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61639563005.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5haa2ph42flss8h94ignmseoc3/33393727892.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/37840461181.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210701232259_862495.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/2755472837.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/30vmudfv8an83k0hoiv7i0p7k3/deduxuxevosevubunosoranis.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765bb53ba68---vamajepenizozegubapug.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/64580986142.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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10988 bytes
SHA-256: db51ed38a32edf5d158d5f06f3b0a992e40f658108032883c0f9f48f3a30e611
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 16936 bytes
SHA-256: bfbc9522f46e3fef56ff71455954c763f6260c5dc70e7778b3604c6e2d0f9cb0