Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63291025fc17911…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 05:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca4c957ef1ac8c814cdcd7811094a11b SHA-1: a18c3d3f8b966e5576124d7a15ab9f3a27de6e52 SHA-256: b63291025fc17911d5d565f9643ce4b2854a7b68dd4fd42215013fc830f0f9e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/voteneminabanexubale.pdf In PDF document text
    • http://christopherspubandgrille.com/userfiles/files/48820318664.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cdb1a16a6---55819234376.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e1791d4701e4826ef2563cc1827c264e/66775471132.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/varapew.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/fejapaxogedu.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/58520803792.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/16920834261.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/vukepidefuwo.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/27943860121.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/94147575873.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/pijagudegoxupoxezasixa.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/946775132.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d54f29b3---68564387111.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/fomedopakujivopeso.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/wugunovexekadagi.pdfIn PDF document text
    • http://short-story.ru/upload/file/18255823056.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/45111649743.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630670297_1.pdfIn PDF document text
    • https://noddy.nu/images/file/pesarujiriweserowen.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/dedetup.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d77cb3f6869fa8f05cd5747f169fadc8/81282464643.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/4173514806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=resso+ad+song+namePDF 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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 16120 bytes
SHA-256: 80ed368f6be405e36e4bce6281d4665417e49ea05432b23a3b70186450f793c5
font_01_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 10300 bytes
SHA-256: ca5fdf69858d6fcb23b0bac4b3e714873cdbab1c534059ac3eeb6ca81e7c6d48
font_02_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1