Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4522df4eabd4e88…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 21:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ea4419c7e62de6e96f6075ab5f6d394 SHA-1: 9fc9b2973019e38054a0982b4f9a685fc879f75b SHA-256: f4522df4eabd4e8841444618e51377b8e9390d4bfba705051ebee0cac8421afa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting payloads to bypass initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=best+period+tracker+app+android PDF link annotation
    • https://sergiomauri.com/images/file/disozegedabofedajafod.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/tutilufuselamametonesod.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16135bc3890946---dikowawafufodemuzi.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/benami.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/xurak.pdfIn PDF document text
    • http://leeandrewdavison.com/download/kibiz.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/buperivebumawa.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/844597308.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/vuxovekuvuwid.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/durebigovazisafowejojog.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/nadunuweboxevilotasotigu.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/92971374354.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/tugagitufufuzowuxevapezag.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/timofakiwes.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/sozinorage.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/9356622498.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/pemutezasa.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/fividivavasetovajulal.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/pubazumuvusimimudakaliti.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/25190020687.pdfIn PDF document text
    • http://goldmustang.ru/files/files/99053266784.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b38b819d1---95319547884.pdfIn PDF document text
    • http://vitrine-prof.com/files/movebilovulasewejebowoga.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/tifosakokuxixoneseze.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e51531f6fd636a3a524699b6b23e8f96/molizavugos.pdfIn PDF document text
    • http://anpharma.net/upload/files/diguwojorulupagupogixaba.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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 17168 bytes
SHA-256: a710281ad9ba1adef3da44d17c9f31654ad2e1d937295984dab5c7895488d2a9
font_01_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 10604 bytes
SHA-256: 8a74af5a1c7d010317471654f1466d1442c7b9ad71b9157deadb26ad7c3904e2