Malicious PDF — malware analysis report

Static analysis result for SHA-256 605cb59beece87c0…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 07:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89634f47bd8e74deaf0f88efa961e434 SHA-1: d3dcac9830d4aae6a3ac72de248abfe4b73afaff SHA-256: 605cb59beece87c068ac4d12664471cd5ad896f76d008a3bec6a3ed34a7ba0ea
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://allprintusa.com/admin/images/file/dulafitizomademalitasom.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dce493803f333c1c2130f89ccfcbf54/32463680728.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988a67792f1---tomosujilinediroworak.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b8063962---59378959609.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc65777cd0---54877445085.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/3b4dabdec54dd184c713cefb0347ef60/73576648479.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e45d62cf---zixukipak.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/gukot.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6437d2660e---mawefisulesitirigowoxurud.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/folezezexunagasupo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083132746000---vefebo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qcchjnbc86u2hh9euf64ggt3a3/segas.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/52833496253.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69e771c40---vazilugetuxuwikudasosed.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bef43f07c---40396529165.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/48366388517.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/nhtkqiv0l9jd3sf929aue23g13/betaxogujimumix.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/466a4de35b4a61c2f2eaa5e294f4cb8a/wofapefutalujekemugijuras.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/46096405450.pdfIn PDF document text
    • https://blokhol.com/upload/files/govejovo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f292b21e---63999286470.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2da338e9cfecffff385d2add4be8bd9e/77219157967.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8abb480f6---85593357225.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a74de46178d---9743589866.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/57847204265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sales+and+marketing+books+free+download+pdfPDF 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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 11236 bytes
SHA-256: 513f8cd9691ce2862b496f3addcb6d08084497166b1c0a5779b1afa3641d61b7
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 17648 bytes
SHA-256: 504a22b7177d5fc7089345c3cadc79f48a65da2a73b2df9739b9a8122c1f426c