Malicious PDF — malware analysis report

Static analysis result for SHA-256 f676528743f60894…

MALICIOUS

PDF

76.4 KB Created: 2021-06-29 23:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 807bf9910fc2f6366aaed81ed696fa2d SHA-1: 81fe5f4a66be5cb40c87f761ad7be732398eb60e SHA-256: f676528743f60894cfc222e3ca67de688722caf06c1dd581a51657b2104b387e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The structure suggests a link farm designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of numerous external links indicates an attempt to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/86d2038d082b52db8b722577f6099c6a/53161390812.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d8422ff7b1c59668a6e5dde0e5ef79c4/2311730452.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0dcac963---39372869196.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d08b4c3b669---47898274063.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/momajox.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9ff068a8e5b88a309a468418fdc1028/46032983461.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088d542b7e84---85582813996.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/643dfb63ddb27dd562479af61d0549a8/24567200316.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/71710017734.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c683215daf---84704756161.pdfIn PDF document text
    • http://planetamama.ru/files/file/wuwemevad.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ee40fde2---lopobobasomizolamu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8945f59b35---36923037016.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/wubonipajamafalerofizun.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/57470109551.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/62218010011.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2eae9b71---64764921766.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/niforupaxekazefug.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/paguduzadoxaro.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a7bb5d41fd066aada06647211a6aa23a/71731294513.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/26453688949.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e603b56ad7---dabilij.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/26169029601.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/siwigagafimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ethicon+knot+tying+manualPDF 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_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 16668 bytes
SHA-256: a4af2eabb7e1e0954415a694a89d9b69621c670b342c2626253179866d6eb2cf
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 10568 bytes
SHA-256: f29cc552d7e05d2f4bb3b9b220388fab679d2e93bfe16fb28e3ffc10c7e7f0dd
font_02_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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