Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3641ca7c778dc4…

MALICIOUS

PDF

78.7 KB Created: 2021-08-27 19:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cef6abb5a06cff4b3a1ae724819f88a1 SHA-1: e76d9d011d4fd7fcb18a8a6f49ec0f17599d9156 SHA-256: 2d3641ca7c778dc4455c4af7a75371059405c6ef24eda3ec892fab71c85caefb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve to redirect users to phishing pages or download further malicious content. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest a coordinated effort for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/af8b6cb260a469d24c468942e64b9c4f/zimedarunoxuri.pdf In PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/gusimusi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2f8cb0c07e2cc71773b6a5e6d417a548/jidabakesos.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607632d4b961b---1550153087.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f118b059963a4318c02e8be12b8e8053/25545358525.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/rigajedivek.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/suqmenf1f9jbijiu6k6llq3snr/35486630184.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/33411936461.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wazopuweris.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d516d63831d---94064748549.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/15014650618.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/tofobekemutalevoxar.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/12843952947.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/9364229503.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/valikixen.pdfIn PDF document text
    • https://jetaime-shop.com/files/21380498903.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/27mtknrpaegpq9eslru5ujsmn5/xokafakisikemoz.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/lelakamufilinugegamut.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839a738b95c---64972463165.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kulunutubez.pdfIn PDF document text
    • https://invest.pl/userfiles/file/41853818187.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/72742107825.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xudukaf.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210811102854.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/56747628019.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607db00402324---lekonotafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bloody+discharge+from+female+dogPDF 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_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 16736 bytes
SHA-256: a4eb6dff68b9969d8c55088c3aeaec94c8c655d4bad84d9558f458536ee6012c
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10888 bytes
SHA-256: 410bbcdab9392491d84135dd3a0cc519909888f0969a9a9fb792e13f6184e49b

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