Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc0aaed0e7bb06f…

MALICIOUS

PDF

153.4 KB Created: 2021-06-21 03:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 91b2144a104274685083753996617062 SHA-1: f8da8a2bb85be1ca10d7712bab71151b3d699502 SHA-256: cfc0aaed0e7bb06f12886d99b24df45a450318907e1bd895f39461e5ebd70583
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/uplcv?utm_term=surah+yasin+sharif+mp3+download PDF link annotation
    • http://fouladsazanco.com/Upload/file/4709462338.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade93d5dabc---40189684867.pdfIn PDF document text
    • http://premium-t.info/files/files/67755604317.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/33010612963.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/kumofewawumutonebulogoso.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be3066ae47f---78397741995.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623565390.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/parozedexej.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/fetol.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-15/20210515180328318519.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9jcp3to5a4raacv4gpla0loup6/dimilifizivopusawelamizaj.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/66628691248.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file/%5C/2021051719503231.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089beb879e5a---repotoza.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ga7rp0n0oonegqtm0h4211i3s9/43518215278.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a03c62e3925---89150357610.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/7u7movhj2ihshgepjooaohct13/73154615577.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cjc7mfcelhj36ceckne9mtgjv1/sosig.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609db16cd1255---69940172522.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8083037730738bfe7009e4ab2f019deb/54160439192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000212c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x212C2 39652 bytes
SHA-256: a6d4dcbf5ee030c63dde2faf7bbc400fcc935c9acf99ab713bee10922eb2043f
font_00_sfnt_off0001c90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C90A 1636 bytes
SHA-256: 28d2b9298a31735e401c974038d07caf95cfaa5e7aa761d23ea6cf95fb815104
font_01_sfnt_off0001d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D147 5744 bytes
SHA-256: 51cd81ca51d3b0d1ca24bfe185ef72fc7bdd0e5d180645d0bad57711d2281999
font_02_sfnt_off0001e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4BD 2072 bytes
SHA-256: 044cf746dda20429b261521fa8cfcac96d06a6a3fe6cadf4c7ede8771acfdf20
font_03_sfnt_off0001edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDAE 11048 bytes
SHA-256: a3652ee18828117f69cc8487abe0327e2831f8cef77ea0e3b40ba5355b1e392d

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