Malicious PDF — malware analysis report

Static analysis result for SHA-256 a236578c9fa73e6b…

MALICIOUS

PDF

89.3 KB Created: 2021-08-14 20:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f17daa3c5cf4ba134e0f810feda3638c SHA-1: 8c01a2743d277e6e69ef3ef14975e6d19c4d18e4 SHA-256: a236578c9fa73e6be079a64cb4347f98a8302c6e304c7a02df72233a95e4944f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or sites with suspicious content, indicating a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.mostenpo.jp/userfiles/files/60384774518.pdf In PDF document text
    • http://moscowprice.com/content/xuploadimages/file/33315732074.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/1039187229.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a48418b4---32457873967.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611801f0c0ddd---katutitanitusumoros.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d39b0c937---73925009029.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/ripejekilewubak.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/14627266788.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/77436990078.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/fadofupinezufuwuzowa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f57b84b77---60033603457.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/tijijimowotasutig.pdfIn PDF document text
    • http://planbmedia.hu/files/90116679861.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628a6308b4---nepunus.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796849d95c2---bomafo.pdfIn PDF document text
    • https://proxus.nl/file/guziwuxexuzapoti.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098306d74c6e---pimudaw.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/aevo7ceog6mo5dv6q8vumetol8/teropax.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/s0bu5lvua2c0ts3p76rm4i8cou/tikeputoxajinujibagi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb1def6d1---76078576466.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607187d899828---kitofukaxowekadagefap.pdfIn PDF document text
    • http://jar-ted.pl/file/67735465980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=where+are+the+chromecast+pictures+takenPDF 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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10776 bytes
SHA-256: cdedff07796dc021fc5bc8a4545fd8112ee8add5da6d3b2a3d7caa7a056a35e2
font_01_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 19932 bytes
SHA-256: 8bfcd9f16ac3285948598e30fbbf73d6c43bb9718ec40958f1012c39b2e6c03d

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