Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4dfa09a1c029d0…

MALICIOUS

PDF

134.1 KB Created: 2021-09-04 17:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6f3c87df1f29a297c2711b6f188d9f22 SHA-1: 8fdbd947c38107f06335cd8bfce67325ab2b28b4 SHA-256: 0f4dfa09a1c029d04371df6e09eafd8632ae6a6063d24a3d9557b9e1141eb8a2
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 0.9925

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 http://maszyny.pl/userfiles/file/rukanasinedave.pdf In PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/novinevuwedo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/262d0bb3c195e26cc191f203e4910876/kokatagazurazezivok.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/32691986397.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/65555724035.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612571cfee622---82204438773.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/basodotelis.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/libutigosuf.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037a6a0d19---kepakinojorato.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/28023304891.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbe235783---10774010676.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/17490222862.pdfIn PDF document text
    • http://clingac.es/d/files/safenenosoxozokebuj.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/7703297013.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f473e1d65f1682d4c7e7ed1bab9aa01a/62614185962.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/65000763019.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/48921691501.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612612c95b9ab---tomasotexup.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/barefoj.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b3f89beb7---vedunukuzunutisenij.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/39787316957.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/26042650625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=perforasi+membran+timpani+pdfPDF 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_off0001a773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A773 19420 bytes
SHA-256: 0dbf27b155f88139ca2353cb96fd3e691cc6994a74d41ae43a386c2bc484f86e
font_01_sfnt_off0001da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F22A 10756 bytes
SHA-256: 370409d7340c6d07d8f0b674e24cb9074e35a28916b6bbbcef908101358a8196

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