Malicious PDF — malware analysis report

Static analysis result for SHA-256 766ae053fb929d45…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 19:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de2f0fc63edff4e56b27304d9a1e7703 SHA-1: 3ed2d81b74c5d9e7a3e0ea63426f8e1397b6d50a SHA-256: 766ae053fb929d45acd107f719b67be4a8c40bb75a374a98b0bfa6f1db92dedb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sitycare.com/FCK-UserFiles/files/xumikeledowafufokuzifez.pdf In PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/35111847633.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/61008592712.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/vurozabatapabugo.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/98834071134.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/mopilonegozuvutedawupamo.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/41168639487.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a9d815fe---tewajujul.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/sifevopakatux.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/vugagupuzo.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/vifosubif.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614014d392602---33427172243.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/6193221279.pdfIn PDF document text
    • https://kar360.com/resimler/files/jevozazedegujofixoz.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/bekamupilepeke.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/maxozixowarilekukajapizij.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/xevefozujule.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/murabopidatal.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161415a4a14c7f---mepip.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/17408968955.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vegodo.pdfIn PDF document text
    • http://protezas.lt/i/File/logidafoxabiduda.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/4006330399.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/90189807301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=naa+peru+surya+naa+illu+india+full+movie+watch+onlinePDF 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_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 11228 bytes
SHA-256: 0d521a3cd19c7c931eec2ed6f5a73d3f38bfed16b3350b9603246243cb636e63
font_01_sfnt_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 16476 bytes
SHA-256: ba756dbd9548d8b6872cfff0e06d245dbfc2a2b79f9f3281574a91b1edf2efe4