Malicious PDF — malware analysis report

Static analysis result for SHA-256 935247af4b63ee30…

MALICIOUS

PDF

76.3 KB Created: 2021-06-21 07:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdccf83478121c2d28996190ac6e2922 SHA-1: 34eb016bb1e3d9a16237251f2fcbc6e31a2a3069 SHA-256: 935247af4b63ee3021ce36d6e5abfebfe3a3268e01e5b8e2683f7a1e99dabba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics and the authoring application 'wkhtmltopdf' suggest this PDF was likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/feef1fc821e48520ebd8d736d1bbe1b3/wezemubejigulu.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f794e605---bofadexujowi.pdf
    • https://easybuildapp.com/files/uploaded/files/zuluvosev.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210621_D89644480308C874.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c824b0c71ba2a1c3d868044d85c54871/34603455530.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/30863504547.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab82cab22d6---daziwitedowatejubebekef.pdf
    • http://grabnerestriche.at/46864074310.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e133bb14---35173486929.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/81e4131e1dbf63703eb53ef45def0ef5/61734729980.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/8a3a3065d3b6b4b994607c437288d28e/95387258510.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/33214f461d2b335b900475fdb629d66e/14643093726.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a168b21a759---93328919861.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2a26a2b3---neridapidogudevaganula.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1705eb6258d5440cca2797188c1484d2/93568535126.pdf
    • http://moyamoya.center/images/hand_uploaded/files/99606927228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=magic+school+bus+digestive+system+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e764.bin
c0c5f4107f5acb49e623c08ffbf92789550f49ace3f6aece0ba910c04f92d762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 5816 bytes
font_01_sfnt_off0000fb25.bin
0bc1ba897a48e185e8f2760f0b312ba90638b1499d670366f456c4e7fbe69c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 12668 bytes

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