Malicious PDF — malware analysis report

Static analysis result for SHA-256 9433294e57d29bcd…

MALICIOUS

PDF

89.9 KB Created: 2021-08-18 12:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bb342a32377094d271fce8f9279c28d SHA-1: 49b3063744517b0250f9d951a5b8fd6307d4fe55 SHA-256: 9433294e57d29bcd8f2b2bbb063db8207b2b266b6db0dce73af7b307c5c9f839
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 0.9994

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://crysiq.ru/uplcv?utm_term=tyt+t%C3%BCrk%C3%A7e+s%C3%B6zc%C3%BCkte+anlam+c%C3%BCmlede+anlam+test+pdf PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dc07d66cba9deec5ab917bc84a2d1ded/gazadobosofopatezulo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c417708d337---mirotafoxominawamuwizuw.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/kolifesogitojitijoser.pdfIn PDF document text
    • http://erictex.com/ufiles/files/zitosedefopopadido.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/xenimirofajulinuxiw.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/82315877934.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/678751c7a31e0ec6440bb770163280c6/30957771684.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16c0cee06---makimutufusojokimo.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/10025761044.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f099c266a6---1353557468.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/wegolamejedeta.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/27403325777.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/13202694625.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/64914473acadce81b926e41745f70aa7/xibosiwaraduneluzuze.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/86597377886.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fcec23971---95265677103.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c827af2e28---kumanov.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/35983301459.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/megofilifuken.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9u5qq52f8nohs3fgak20ahnom3/39041198703.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4503e0c2f---70237260398.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c19d66316---lodidewuvatex.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_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 21176 bytes
SHA-256: c4a9d14f8b2f11b1f31281a0754f1a8162aa8978d2834128bfeee83121858fcf
font_01_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 11400 bytes
SHA-256: e91daba628c226c4babf43349b99388fe3b17c90b1b7eb5ffe22ae889e2423b7

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