Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b379b2187d27f8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 04:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 900badb8f8cc7be355e31ff7177d823e SHA-1: 31fde1424b2046c37f881809f10e002d9ce7feec SHA-256: 96b379b2187d27f840a8cba736979e0481a4d1134cdc59cb483456919f858219
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=prende+tv+en+roku PDF link annotation
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/ziwomabukimoma.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210910002208.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/diparabumaruxor.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/66121293519.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/fejokodolawisoxiz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/woxemikasorukewuxofunin.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/80025891227.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d182a7b080---22318409819.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/43930604464.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/murekesurilarosilun.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/19527173740.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614279dc98884---16773397803.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/rinediluzufoferuvajarob.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161358b58b2b30---mewopiwata.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/88628412963.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/54004587235.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/dazinodufe.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/39284372799.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/dowadixakodap.pdfIn PDF document text
    • http://parateam.cz/file/kavapuzixawewel.pdfIn PDF document text
    • https://cicimanis.com/contents/files/fikuxujimut.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://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_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10032 bytes
SHA-256: 29b5b59059ecd262dcfb82b83ef631aaeec6c8babb400ed801da9ea14f8a455b
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 17844 bytes
SHA-256: 21eab0b66fbc3e33ee450e7b4de4c41ea87fa750ce1ddd6278e83187c1d531d6