Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e1c7e4e6e261d9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 12:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b7e016b7c3fdb6d55de91934860d85b9 SHA-1: 63e8de92f3c8b6a5e568c19b399ff0662c8424ac SHA-256: b3e1c7e4e6e261d9ae5213131260111b6843f1c54cd78e17ab398b1c6179c9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://laborke.ru/uplcv?utm_term=tom+clancy+firing+point+release+date PDF link annotation
    • http://thrifty-uy.com/files/others/84760735048.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bb360976---59815476095.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e21c94fbb---48922577370.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210621194928.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6405e8d623a8b9325a53cdb942dc79d1/40390451439.pdfIn PDF document text
    • http://17njl.com/userfiles/files/toluzumetirizunonigadasuf.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/bezukokujamimok.pdfIn PDF document text
    • http://xtra360.net/campannas/file/70663407616.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/av06rv0iva2t2jprt67e30b0f4/58357116225.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/50741802154.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4fd2948b0838de81d878db4f0e518b14/mireruzepojitazo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16086a034d54b5---97839325552.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12567030462.pdfIn PDF document text
    • https://theipbuzz.com/images/file/65826577937.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/76012726007.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7c59d6ca---nupisodupanigixarogek.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hcopol7ogcm7rul6ls0k5rf61f/51228980167.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/dofixurefelelunegum.pdfIn PDF document text
    • http://whatdwellswithin.com/file/busugobuwawomadi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/65pa95m8mkgsksgr3rjv26r08g/defiruretafive.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061418123073499.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf82b993c2---gunolinabenabonod.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://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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 11040 bytes
SHA-256: e5a9dc07b65671865edae34ffb45807210813581c1486c8e7688d99efa71d149
font_01_sfnt_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 16260 bytes
SHA-256: 27fac252bac28e8d8e551006aaf36c2f03f6613028dcc47210ced24a30d63e99
font_02_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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