Malicious PDF — malware analysis report

Static analysis result for SHA-256 20635874d7abd097…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 15:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c977cdca8ef505968617f76fc90dfb5 SHA-1: 891d0db455aba7c4864b6803d106c2dbd7148491 SHA-256: 20635874d7abd09739d786496e4b1e1f2613a866b2680a10b2160cac73572069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The presence of numerous unknown URLs suggests an attempt to distribute or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kalyna.ua/sites/default/files/userfiles/file/fenabeteki.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/3992519794.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd916143c---nojifusitexekaven.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/18623799934.pdfIn PDF document text
    • http://farmina.ru/uploads/files/xazofojovujudoliletobij.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/09e250f8444026ac93253b1da15aaae2/11299167731.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5cf8672b1---69487025441.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/bejisukepewosaxadimifixi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d0837ac---mewevafisebamojinuk.pdfIn PDF document text
    • http://renovator.cz/files/file/47809698592.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd574be72---54255542543.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/28558776791.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8fsinvuo26ol4kvpnbs568uujr/vuvetutepevupugule.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/36913802438.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f4f2cad---44897490406.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8da0a575---68969946979.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/60905626101.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/kuzalu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d2b6c7c6fb3a3f16d40a2dbe3a0b7320/76268188898.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/26831338277.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/62700360694.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4634edc18---kopanalexumijitewasuw.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608099875cbcf---nutuzadewoxesape.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/98134720165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=secondment+agreement+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_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 18456 bytes
SHA-256: 0b67b48589c6c45b3767e3d540c98a8848647bbce2e8ea5c6cdb210ef27aa620
font_01_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 10732 bytes
SHA-256: 062edcda32924b8f97b27a9efd04573ba1e32486d8aefdb3c118b46bf3afdfd5
font_02_sfnt_off00013d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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