Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77a2e52d443fd46…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 02:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ecd3b4757b870b269ad90d43ca32d37 SHA-1: a32e4c6b3047b8e71cbc101d861d3f74e7b47e04 SHA-256: f77a2e52d443fd4647d84566fffdcc342fbe8af86621cea5ceab5918ac9b076e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://palestraarkadia.it/userfiles/files/26723327476.pdf In PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/bimasiweropedomikaj.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0ce88aca---14298946907.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/67586867360.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/bipufidivelusoxesasaj.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/rabevavope.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ojssnosp6q2rkl7o55hmft2rc0/64457163528.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/49145221036.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/84665675041.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/15177731684.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1a94aff18526e633a5ff665c581d647b/45093175123.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/64626218405.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/84912537157.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddb44c527---xabulokaterep.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608985e4d307a---vixebede.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/67164497073.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/12377317617.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b44218314e35efd14cab7b608451c4fb/muxevejifid.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090033e1acb7---64414706181.pdfIn PDF document text
    • http://teifsepahan.com/files/file/31715235988.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/9223353892.pdfIn PDF document text
    • http://grandfiltr.com/files/file/dekenon.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/33367481114.pdfIn PDF document text
    • http://usagimatur.com/files/others/81895711738.pdfIn PDF document text
    • https://csodamalom.hu/files/files/vubekeresitug.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/be33qlnilo0t3ifvpfm3t0eio3/bizuvikazox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=unearthed+arcana+druidPDF 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_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 17240 bytes
SHA-256: 1d12b461ad7b2ba3e973fcd10cfc40ee5d699164da6a205106c39f7ba9271167
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 10240 bytes
SHA-256: 20b41b0d402f0c6a9635d158b29c0e5bff1b8589899de753f6d1de3ca0de5926

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