Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5aa6e9f32d19f4…

MALICIOUS

PDF

93.5 KB Created: 2021-06-25 21:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 56b43322851f2e3795caf4fa80a6e8c8 SHA-1: 88ca27c472066341f72a020abd963555f8a823da SHA-256: 3d5aa6e9f32d19f4c2fe31d645e4cb1f95899c2e021274fdf38ba8a4403447a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://medvor.ru/uplcv?utm_term=today+tamil+news+paper+pdf+download PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bfd3416c---sasuluzosag.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/73946975140.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9228ec7d9d3bcbf7febc62f8fe9d8ecc/sulejijatufimumamiw.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507101432633209818.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054a09e9ad---43018857814.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061420570557.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hu6cs831t8ibookcho111q4pk1/56472221143.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c55a25b8---73933394702.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c74b70b30b7---xuxinovujiwap.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ecc440bb28daa25df89a224421192428/badawemizadiw.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/futazadodibuliro.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0528e6e62e---pirekapimegazif.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/03841bb7753c2d4937af4e30d1e21def/97264071829.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1367312842509c321b0536f5d2beff0/woxolikenat.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee8d936a6---24512704613.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c266655aa---98571778673.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47f53956e---51642742850.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd38a8652d---52205564512.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jafoxalebuwerakefalejobaw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c58a466bef3---xajodaku.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3964e4d11---72005311192.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5084f361a---89783739311.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c525736ed---13185973546.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/bavimexulekexuzabubiwu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10824 bytes
SHA-256: 4119014135923df16a9f26cb402be108c805dd55e208edf32d3eac5ea7acbb38
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 17768 bytes
SHA-256: 10df62dbadf90526d853ec1b91eef6f643e41e05c0d006d5efabc75d41bfd2eb
font_02_sfnt_off000138d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E2 16144 bytes
SHA-256: 319c1d6b5a9dfe45ef2c311a2d5ba00a192ff2e3c7a2103ac7a27dba584f9d59

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