Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58679afc57672de…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47c4e61761794b2747d033947e18bc67 SHA-1: 0b7c4dd47df4c475afb7c8b35497c49159771931 SHA-256: c58679afc57672de75bebe70c2c33b3b84291a077043e34a96fefaa02a1f91b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ttmplus.com/userfiles/files/zifirijibugitawub.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a2ee1d56398348c0ee5e0a485e5fe43a/leligojajowunafodale.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/10284571417.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/lanitawinojenabujesupidi.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/17657991378.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/xeravugevadoxugalape.pdfIn PDF document text
    • http://workontext.ru/media/file/39950186481.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/22495496503.pdfIn PDF document text
    • https://makenie.com/upload/files/25818720379.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/dodawusibokuzoxifopuwaku.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/31906043395.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/61010749027.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/92587514971.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/36108808422.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e4c040003---bojewulidegaf.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906220304.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/12750255015.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219121642116791.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613415043176c---mivikodafesu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0397da85---5334942201.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/wavabonolexi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f27d59c06---47718067836.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ea1291e412f6d52878c373c5ffb55c42/85846450439.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/wajizariwopobesoj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161409368602df---lasuxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+apply+themes+in+androidPDF 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_off0000c1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BB 16076 bytes
SHA-256: 26f640f5dcb4e7834582900a78dab1a850295b3792afc22769497db8fb579613
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10848 bytes
SHA-256: 5f5dae7aa520d3d001f50518ee6311107ac2db6b4940f6a4e8545515c8e1e2ca

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