Malicious PDF — malware analysis report

Static analysis result for SHA-256 05225f7f33e5bf5b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 02:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d252f2487694c95eabf5684f3fe5eee6 SHA-1: 8405a31502dc4b655c7f102d3228ccdb002cf7d7 SHA-256: 05225f7f33e5bf5b2b71a3a73417575267ec1cdbf09aa9f4b9df9688aecf0646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. This structure is indicative of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial vector. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://craftland.de/res/wysiwyg/file/newapiwixower.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161233d6ec6940---40372916326.pdfIn PDF document text
    • https://robertbah.si/files/file/xajokapopifuwitimoxafem.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/xunuxudab.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/48444322247.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/76198e9b6effede243cd72dc62e666c9/buveva.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210718_040344.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/guruzerozujezugavikavasi.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/82838353125.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f779ca68---69390776074.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be367b4c84a---gogufegilit.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4eb6a551---55450184553.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/moxajogivomubapesudonuz.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/57227409234.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zukuxikepujunil.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0813994001620325591.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6113995a579a93326f03d5777fa7080c/17356997508.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/31bd9ae181a450cc240d1ebb7790b14b/xiverexawifedepevuduni.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/94256169313.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0e21e45f815487d6b9772d34ec2ec47a/guxikigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=simple+subject+and+predicate+worksheet+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0474faa050ce5d8469df0b381dd3026c/kawufedosujubuzetu.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 18252 bytes
SHA-256: 804c507539a46baf0d7731f5d29d4fbbcb4502d8daf849fff1e80c57fb479dfe
font_01_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 11508 bytes
SHA-256: 82ee13531a80496a4a5b81900b1a5965404cf31174088c65c00895607868d8a3

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