Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb78d11ec7526cfd…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 17:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8399d05adf247f599f8e6edc2bf792c SHA-1: e780ffc2ddfbcc4dac6b5f3d2778d8b7085c57b1 SHA-256: fb78d11ec7526cfd02dbb468bcaccdbe28972519ac74b85a120a016b00201448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate this PDF is malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=android+adb+driver+64+bit PDF link annotation
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/43587274654.pdfIn PDF document text
    • http://manu-transport.com/documents/file/detavas.pdfIn PDF document text
    • http://live-net.it/file/rewusowagu.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/genanegikokalimaxunane.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/583935ab4aa26e5789ca2e0ea107c76a/2846758789.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/vigovexukovoraredusubogap.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7f4d4baf8287a13b70915baa82f3a4cf/lobarobomexexawada.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210915_140457.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/damonajiruv.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/movuxolo.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/libilozozopofoputakuwel.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/42524d1c059270dc86a1cc614e52de1b/89838403650.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/pibibijuxedosemetudipom.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/20754865386.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109161650133734.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/wajet.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/9288883802.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/61620579617.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/fexosebufumarewedofezeki.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jakijuvojupuwur.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab379d62a---37988493647.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba5fc9151---46978538668.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/10542772917.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/tudokemulididoberunanox.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/45474475776.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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 10460 bytes
SHA-256: 71f05d6fbaf9a735ae034458fc7599e9b5555a2462efd20fb4840c0914d88148
font_02_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 16748 bytes
SHA-256: 48b92a77d77b5deeba3feb80376afa68f92a0314a08cc7b4af22225e863b68ca

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