Malicious PDF — malware analysis report

Static analysis result for SHA-256 9909c8e18cf340e9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 06:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 672425f2672893a1168bb8fc023bf644 SHA-1: 363cc58a7c355dd739553e7eada51b67839986a0 SHA-256: 9909c8e18cf340e926b7c1ed6c952c76b0aac840346846dfe7b25b21210ed3c2
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 0.9976

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://smidgel.ru/uplcv?utm_term=research+process+lecture+notes+pdf PDF link annotation
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/zijokujitavasejib.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/26336764266.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/74587906072.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/43985514198.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4c54c46d50ff3e646920d042e728679e/12152110902.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vonewaleketasafiwewinebi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160decbabad826---67034836709.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/a0ivsbh25ojui4a7ut49fbth27/tisusenunagekejavedinoput.pdfIn PDF document text
    • https://inncredel.com/uploads/64942306654.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9b6e2186---22970733139.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/7794705656.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/21658743426.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65930a86e5---6120575658.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/kafupokolu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/25907826779.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/10761931edcbbf468f8ecd57340d2ef7/romovadami.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/fekiveninomojevowagajire.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/22208768791.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/pimuwidir.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161052c11190b9---rexilanenuwemifetajave.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0368b70e4---92947040206.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6ae40e1f99da805e0f41c1df215b65fa/52730515391.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/31996934034.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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 17372 bytes
SHA-256: 0c1458660dbee04b141cf6dcff67da22db91fb801583b359233680f8dee6fea7
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 10768 bytes
SHA-256: 653bb61377c589a97ba6401c88956c2316fd95e654f6cf23913e954199ae7bf6
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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