Malicious PDF — malware analysis report

Static analysis result for SHA-256 634e3da154293862…

MALICIOUS

PDF

90.6 KB Created: 2021-07-31 07:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f851a58a683a69e0d3afbeb1836ac8ab SHA-1: 4e8e52c1c37556a21d59acd95f1d2381119d553d SHA-256: 634e3da15429386218070e20c7fa6d09bda027221f1c09feeedc74a2240a8c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to manipulate search engine results or distribute further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/298b061feb66c6b6d886fc58446d9694/mafujivokilowige.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a65d25bb---90531888010.pdfIn PDF document text
    • http://zaiger.ru/img/file/nitime.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/99123310385.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/66327096826.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/6021532405.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd4827807b---pigizaguko.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/lopafodasupomesolife.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062603120480554.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/fisen.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7eb950ed---75543773089.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/duzexitazelim.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/kebor.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49976ee36---fofuxexegojebegarosafuxa.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5858cb4c68bc42116ff3368cf0763a41/49199275725.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/23395921849.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6750ff5c672e6339dede2a485a5e2a5f/josojibifawog.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071f27a807e2---91978999987.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c77aeebe6a865bbd0c62254a8e72a86a/98053520241.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/79213605248.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/15754568146.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080b28159aba---sulomonaralo.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/jufofovadagibapapiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=differences+between+sexual+reproduction+and+asexual+reproduction+class+7PDF 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_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 11092 bytes
SHA-256: 85502b45fb5ab140edcb1ea853e188a412f5c5bb7b5fda58daa195e828c3bc4d
font_01_sfnt_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 17684 bytes
SHA-256: 0c8706a06e69daec8e764526e56be4d4012347e45aa8c3dcf5a920d2880886fe

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