Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9da1796e40e9a7b…

MALICIOUS

PDF

90.1 KB Created: 2021-08-15 07:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ced29b6285bd802e478d78c80665b119 SHA-1: ecbaa4349be7ace8bf2fd8d945740bf9a5dffed0 SHA-256: c9da1796e40e9a7b13ec571298632d7f7a853ce7ea737109ef2014481a19a72b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or lead users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selurexak.pdf In PDF document text
    • https://vmwarts.com/ecovic/file/92161692123.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e4315ed---99976770528.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tivewemasobitodilu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q3l13mvsaliao19cvah5uj8h91/bigapevazuzazajexo.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/fivogakoki.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/nekexajepaw.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/nixepaponafafure.pdfIn PDF document text
    • https://sharenkon.com/files/givodabituvavobixixifuji.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/91900629151.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/pozovilurogokega.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b24fb54d8ee---23223924679.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/40882571533.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a288d04955---jufawununojabevoro.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/76541395449.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/470a65bb2a112bbfa9b0e998ccf66ac4/galelamofipubaz.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/82b50bb51d78fbf210ca53426393816e/goxurafemiw.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/11kvdl6lq6bvvbtiqpj7kreqf3/kapuvusexefimopikamif.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/jokazodoxuzes.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/sepobesetavidupu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/m4qivoq7lorallrofjqhr96kp0/99657555459.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/55248449776.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/10252001536.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/98607756991.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///54886665119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tekstil+%C3%BCretim+takip+formu+excelPDF 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_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 19304 bytes
SHA-256: 37ae5148503b1aea22d8599d10a992dc351ec13ec95650e78efa48c9d48e8a7a
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 10984 bytes
SHA-256: 3f5bbe0d52a9d09ec53cc8a850fbe02a7bc839527dbf1e08e996062ad2f3eff8

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