Malicious PDF — malware analysis report

Static analysis result for SHA-256 12211b67aa901c47…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 05:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9122c07a8c21df1cbc647b64c22e8c5a SHA-1: 4d285f8424c181ffbaf2def1ff336b074d730ed8 SHA-256: 12211b67aa901c47b92b35148cd062fffcf51a0bb165a9be27acf17f76af46f1
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 0.9949

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 http://diversecityuk.com/userfiles/file/modoku.pdf In PDF document text
    • http://billsky.ee/files/file/paromafi.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/13799068987.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/59536873897.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/rixovekoleju.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zozikofades.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/36039670635.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/93987485019.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c773295cfe---kidulovuxivarunovirezadil.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbbc2a9561---15562066479.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/wujelin.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/tojig.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210827000126.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683883669a---vigekiditimoguru.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/vadivolezarumari.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdba73b47---32961747708.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/samesun.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783c6886a52---denexi.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/3588005804.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/70262626246.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/99389704997.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/68346744188.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/7fd470eba643c149184e22d88c75fb4a/japorovav.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/pekajobosu.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/zutufizesiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rtf+to+pdf+androidPDF 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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 10192 bytes
SHA-256: e27d5df9cc4005e44fc9440c37625129c4dbfe5fbd53d7b7ac6e6ee1e0b53767
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 17872 bytes
SHA-256: 7c45c994d047ac7583543ab002870b4a19985e10d9b27553c3f48ba64993ab60
font_02_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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