Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f72e1d6fba30b1…

MALICIOUS

PDF

93.0 KB Created: 2021-08-05 10:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 418559ccd6710061b027ab9e9c0940d9 SHA-1: 528b685dd0abda2a4ca2550bc0a74e3d8a127162 SHA-256: 72f72e1d6fba30b1ad9a3c2bcd48c6525e1468fef704ac852ba5d623ed6f646a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The file functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://posaonakosovu.com/ckfinder/userfiles/files/wiwepobefovupatexomil.pdf In PDF document text
    • https://chp-travel.ir/data/file/dilijezalulexafetakemizon.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c1068ee7a---litovamisijemalofu.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/fuponekadepewomijubal.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kh3rnpbp06rg6439nds99mdfb6/zaxufibebavekavun.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/79509d34434388f0770830e4788ecb93/81323174405.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/16056678726.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/fme9j3tks3ckd6a1b6tsr7a766/gadakisaxinusuzosupe.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bcc00d63---19497196052.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/disuxusetekasi.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/luvevidudotipazefenas.pdfIn PDF document text
    • http://vodova51-53.cz/files/65516062172.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6477c293e---vomutabolutobipa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pp08mgbsm39jr1bqmss061ibs6/baboxo.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/mamipasogafogeduxunuwobo.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/1005148318.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/27682974568.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb805675b---detoboxem.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/11871240716.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076360e28f33---ruromupajexa.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/62144479498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=resumen+libro+el+jardin+secretoPDF 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_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10948 bytes
SHA-256: e1337889608ca1d02d66060c0fe319353c1b1d02dbd236274bbf412571020af5
font_01_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 17752 bytes
SHA-256: a3b9e594430688d14b2f7eb84c6f146a7f91318b8f5af211c5cf23bbf703b16f
font_02_sfnt_off00014c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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