Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc975bd24a2146d4…

MALICIOUS

PDF

90.1 KB Created: 2021-09-07 17:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60aef4c94a838e9ab2fbe329e91bfff0 SHA-1: 479e24ad671fea9aef3287f25c295c7b6f71f889 SHA-256: bc975bd24a2146d40da07763714e30f26940cd3155264d48bce47919d5d7312e
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links indicate an attempt to redirect users to potentially harmful content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bab78e46f60---furobuzisog.pdf
    • http://tamtamphat.com/upload/files/23636299785.pdf
    • https://dm288.com/slicice/file/xaderixagifamipizalo.pdf
    • https://airbays.com/userfiles/file/64073211759.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160876e15ba3ca---vajas.pdf
    • https://homeuu.biz/upload/ckeditor/pages//files/65818747775.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e286e57dbb3---fevizegatizinexe.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/38a795a1c8fbda333ae6ef083237e519/newugabuvekefutanuvegabek.pdf
    • https://svetplus.com/userfiles/files/79955498821.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a4793b52---37213265046.pdf
    • http://a-b-i-s.net/layout/bilder/file/murojogipawojarak.pdf
    • http://myblindz.com/fck_user_files/file/41480241184.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6d7c35d5---kemuxejobosojejamojovi.pdf
    • http://zaun-produzent.de/userfiles/file/87260403631.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612e84b64d81c---33909115820.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/64d56fdfbce1cd44820e1cc0e7bcffa5/99940531461.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3db2e2517caf9f4d41052f17485fff55/xorijexixe.pdf
    • https://renhedc.com/uploads//files/202108091923118594.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6cb51d2cf90e55dbdad06b2e6e1fb2e0/90625355935.pdf
    • http://tucholainfo.pl/userfiles/file/91141826910.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8cdd7ce4---58474012869.pdf
    • http://bnblspecialities.com/userfiles/files/ziguxalirivupoboxab.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/sariloji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wisconsin+withholding+allowance+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes
font_01_sfnt_off000110a2.bin
436877d643b252a3fd61cb7a6919101a08894c848a53375484277a91777516b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10820 bytes
font_02_sfnt_off0001295f.bin
750d43b0d8e0b615fd7cfb7ed424d5a366d135bcba6026b29dbd1f0203e6d949
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 19084 bytes