Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b52a19d718cee01…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 13:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a83382e63637439b3a08ce07c2787448 SHA-1: 79c4d9393fa469d2b3bb295f67854b113d3f34d7 SHA-256: 4b52a19d718cee01b46dade0b9cfd8185278c368f77a0ba4220b312dcf57dc6b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings point to a malicious link distribution scheme.

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://nhahangphongcanh.com/uploads/files/18486950978.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/s4dapadkgg8gimtdt6bcng9si8/32371928064.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pazod.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8754a81539fbd261b6902d024da4d33d/xopewubojitemale.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/xixafubifetoreduperesusok.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/sebanimakurirodib.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/babinoxuwapixefugaxib.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tinanolosetujetegelot.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/tavuje.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/43167684573.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/7381223619.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/11724065407.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/37038091459.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/narorudibarum.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610538e14fd7e---76292320102.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7288bcebbed144f85b75a02a299c9f8f/tixot.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d130c0e76---3178408643.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/52214959878.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dc7bdcf3982---sasutasetujefaf.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/xopedutorireja.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/jazufirudakap.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/vanuzilesas.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/motunizofimomo.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/kegabixerimuvobofiwofe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9ak19tmuorrfels9kf1nh1ok9m/74542198885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aadhar+card+format+pdfPDF 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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 10324 bytes
SHA-256: 22552c62af20fa744027bc36652392278ad83a930983d86d07b2d38d4fd03175
font_01_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 17644 bytes
SHA-256: 98189083988707587a6ed41fd34ee106ca5891d89bd88fb2a3c81d14a6a92911