Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86e7e6d25523192…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 00:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c1278af8c7af69c1794e6d0ace49b178 SHA-1: 264231b0207f9eb5d4fe96e133fc16e4272145fd SHA-256: d86e7e6d25523192bc30ffba462e997beeb0657d43b2dcaecb0f68a6dc47353e
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 0.9968

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://inwebjor.ru/uplcv?utm_term=ode+to+tomatoes PDF link annotation
    • http://epmachine.ru/d/files/18318849553.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/77731898416.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/nulamajabolubumijapis.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/wixorimiwoda.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/66215612264.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075956425c31---10190793377.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e05893e09621e10cba1542bba42ffbe4/tabidirexuzoxivolaj.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d29364104---86598316646.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/12vos9pcet8anjrc98hg1vt50d/64021485126.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e62744c22---xizizijawo.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/jusowubovidigidaxut.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rhjsjdbp6npmrte3h7enpdjkj7/23969629435.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/pusufudaroxajomupoj.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buguwizoxomoveko.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/figej.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/96149034920.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b4567c13---81699581762.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f52d0c71---97972573130.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9da154c56d---62408084686.pdfIn PDF document text
    • http://hodori247.com/uploads/files/36416667760.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/80639833916.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/rufinewatupari.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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 18940 bytes
SHA-256: f8df89a45446d015ce035d7436b081d8453ae1f39669ced823033da10d06f4a6
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 10092 bytes
SHA-256: a002304418f870ab12e09bc655769cfa97ea80369ea0895ca48ba9be038943c0
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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