Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bebc7898166015…

MALICIOUS

PDF

93.0 KB Created: 2021-08-07 16:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51853c3340267ea302728b8be3a42250 SHA-1: 180406556d59093fc1e4e707bca2ec8fb74d8e16 SHA-256: 55bebc78981660159bc72d95a8fbf1b513bf53d3336a0ec59fd80dcb4757e617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, including those hosted on WordPress upload storage. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a853b0cdc7a---lisaluzawuw.pdf In PDF document text
    • http://irths.com/upload_files/files/81245335481.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a183315df---fokesozamanikojuka.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fuvasemomenezomonevupak.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/zupuboni.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b068f344ca4---fadevuzirivor.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/sevuwovuvonukon.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce798ba24d---disenonevuveno.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/i6ngdkqmfskht9464t7p60qfqq/warevufuvexoku.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/tebuwodurelop.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/16j41ljf623lodmobhda0c34pe/50944179340.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160779aff64783---wegawazarupaxidifisijojuk.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc37d947ed---93120197797.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/82676508541.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/64213657650.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/wuzulibewobijog.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/3049861221.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d8fdb46049e01085ce6f0a82db8bfaf4/vutetotasubexiro.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/36hflrlcpg3eta77teqe7i5cpg/6026887358.pdfIn PDF document text
    • http://blueyee.com/upload/file/140627524680.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abff34959cd---besexudefawo.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/87139651959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=are+gypsy+moth+caterpillars+harmfulPDF 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_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16912 bytes
SHA-256: 0e3fe250ca5034a77eec3f8237e41c2919aea1089adae35ff1008900d6e6634f
font_02_sfnt_off00014ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA6 11016 bytes
SHA-256: c9c9d9f8c3bd4d02e6a04113917990cd72ce82876979b39755c50dbca1634ad3

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