Malicious PDF — malware analysis report

Static analysis result for SHA-256 c393a70fed3ac18e…

MALICIOUS

PDF

70.3 KB Created: 2021-08-18 01:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7a5dc927e52429f58c539ae46142d6b SHA-1: cd25337a5d091389be18ec15cb1dc97397774d12 SHA-256: c393a70fed3ac18e61f0cb9aceb72cb71d940785baa9b80c99e50e9a36f65812
154 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7990

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://queure.ru/uplcv?utm_term=e%C4%9Fitim+vadisi+ygs+biyoloji+pdf+indir PDF link annotation
    • http://tolltisztitas.eu/userfiles/files/benovipirorefuraledeb.pdfIn PDF document text
    • http://oodow.cn/upload/file/210717170757179031y1dog3fg2vve.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c9956e5ad30087fa0291c34b8ec74474/84048847280.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gazosogesulus.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b337b43d97c08ab2bf69bda310298d28/81869122599.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/rifamatuxuwusaloresojugo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608757500020f---26419308510.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/3247854254.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sinebajareguvidolaw.pdfIn PDF document text
    • https://bataretak.com/img/files/file/20926191568.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/nuzejubudijexixepolalu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaac431099---tutebojej.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/56209524505.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/nazemoxisowamifixubilo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7a46aaf2b234e58ae6b636fec9ee826e/dejexijaju.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/588b34b4e613a6ab4cf7a98b160ffea4/21063954536.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/88812245929.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/52d76713bd5c485a8365d62d4c8869dc/79346139809.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/256d3874c8eca54bde877d752b621d9e/62826334595.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76aece273---kadud.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/6656571297.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/wizavifuramikubexularisan.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xarerunedi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/r6ir0fhirsafs8jfug3f88c58d/ratolomirutus.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/iloct1caniojregra67n5g7dlb/niseninalelaxap.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/dumoma.pdfIn PDF document text
    • 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_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 17356 bytes
SHA-256: 605845d87f15f2f22afdd0a5337d0274ed561409c181c6dfcdc7eea729d95869
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1