Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb63a500c1dd6dc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 08:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 43e027cdc4ed43b2df56771d24a0e680 SHA-1: 222a278babba6f4c438b085b62f36b4b2234a021 SHA-256: fbb63a500c1dd6dcf8fd16ba5a6d0518b8b7702faf6e54397598a028f895bb4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=subject+verb+agreement+worksheets+7th+grade PDF link annotation
    • https://steklo-shik.ru/userfiles/file/piwojuwaruziga.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xipokimifezarebat.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sopupofepuxuwuk.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613607a425a31---jawizeju.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a5a77783dd6631bbed378269cc2150e1/12823520133.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/kevozudiretedifoxo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28e8c5f3c---15352972609.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60def1c9---ronaw.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/215452844.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607891fc98247---wuxaw.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a82676a9---6959323892.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m8q4pvep8mcgi3u2rn68s83nm2/movirotiwali.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e01e06f2---72548947138.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96961346918.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/wokewigelibelumurenumaba.pdfIn PDF document text
    • https://mszukam.pl/dat//file/nepejem.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd979db9a0---tatid.pdfIn PDF document text
    • http://myqself.com/upload/files/48838244789.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/godapafajusuzitaxazu.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/detugobinikovodogun.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/41227895193.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/zirosedoxiker.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094cd1113c1---zupas.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/90806801626.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 18764 bytes
SHA-256: 6827a77059041059250911420ad6e2264e5cd82e0aed0b6f1faf465f9c1a904e
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 11420 bytes
SHA-256: 1928a275379c38c1f8b2e12d04a1adb15c00efc6e9eecd05608c1acf2d803ed9
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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