Malicious PDF — malware analysis report

Static analysis result for SHA-256 c031257ad8ca7c6a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 21:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d79ebc3caf85600a05cff02382fd6d9 SHA-1: 7b0ca765b93731c2f1618c837aac23620285baff SHA-256: c031257ad8ca7c6aa9026449787370eed2eb621f79f2f7f18c13ee290635a00a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://okinawa4d.com/contents//files/bamuma.pdf In PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/aa93f90dd83fcf2fcfd7469584d7aca8/87169736436.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/bafomobekozopexi.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/zenujiruxipofugiwojesar.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d97f8b79ef1---depadel.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/62790768907.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gazepazojewavoga.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sexalatef.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca019e733---83986384770.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/dubotuju.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/rulebaku.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///37049320520.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d6kqglf74aoqnqj5jjpso3aq3/64390384283.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/236d5639eeddcbb4d46e663e1aff2a26/41457465918.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/betugediravoji.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b408a38e826---28703482920.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6a3323a48784986b1a349f3bf93a2769/wenapevolovivavalogizebif.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/b3snkv5i5n47n2t4sheo6tu653/13610288475.pdfIn PDF document text
    • http://babamoleskine.com/files/file/vobibivisawetoxuxifep.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102f2feca484---79030847028.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/mujikusuvijedoloribij.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/venigasirasabefabejidaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chemical+equations+and+stoichiometry+worksheet+south+pasadenaPDF 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_off0000b6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 16932 bytes
SHA-256: 59003f512de1dfcd3a677adf36909e60b7a2692863e599109b4f199850cf4210
font_02_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11348 bytes
SHA-256: d07094a0a8003fad64d590f4b89f8ec0c3d070df9670e9595dfd0c89e8c063b6

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