Malicious PDF — malware analysis report

Static analysis result for SHA-256 c264a2d9fa5fd163…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 03:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 047a2f0427682ae0b910938b38d0b7b9 SHA-1: 948a0316e473c7f05f1dd7d0732b6127583a4bfb SHA-256: c264a2d9fa5fd16374424c7105da66115ff220af7ca0bfb0af450b31ff3b54de
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a malicious intent to compromise users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=doctor+who+8th+doctor PDF link annotation
    • https://resulgame.com/calisma2/files/uploads/76443815972.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vedobikilolujox.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/kegebuzofagevuxaloko.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/74104891253.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081756379895.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/mugofejaluxusev.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/83273800891.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/xudejosux.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/98158298988.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/fodozuvivoz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t8ru4hai1avl83rckfbbr24i01/jonulumalejolumisokad.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87442b6de---23955423501.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905210528524931.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/wujorirad.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/64403687509.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/lokujudaxegebamik.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/sotonotegopibijineretoj.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/70278690593.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73fb901cf---68191206201.pdfIn PDF document text
    • http://boldogelet.hu/media/1058788660.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947f11aaaf---72991232218.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/babilizoduwazanifeloka.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e5d1536ef378fd61136d9e0ad3fe7587/91898673623.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/162311266791.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/83281121734.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_off0000c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 16712 bytes
SHA-256: cb2f38db9fc1adb3f93356fc73e5071f2051f6e0eb364622f11efcc4ce06779d
font_01_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 10056 bytes
SHA-256: 907e32bb7812be810b60c7945144a996175c9a8bd2a28ade810e47b5575989f4
font_02_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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