Malicious PDF — malware analysis report

Static analysis result for SHA-256 2599edde7096eaab…

MALICIOUS

PDF

115.9 KB Created: 2021-07-29 20:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 085738496bf209e1866aab573628aa79 SHA-1: 3a372c55706c46559d7bbff559da1570de60292a SHA-256: 2599edde7096eaab024f2e169ae46965d83c3d1d7759359d137fe8dcabd7c537
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites and other domains, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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=actividades+para+2+grado+de+primaria+matematicas PDF link annotation
    • http://generale-bureautique.fr/gdb/files/file/36865992076.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f639e57a84---konoligupadegeja.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zatuwoxapovinazusisek.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3504ee8a48---jupipujavojevonugipok.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/35356341022.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e7a744e1790452720648cfcf94439335/90925893335.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607000ae72d6f---90981188547.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/46397821212.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/butupexigar.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4856563a903ada180b73a04ae1a0aada/88249395193.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/edacefd12ec577b248d868ae7c2f5af4/munazavavulageludalebo.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/21933809150.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xanakelepewelidowezerawu.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/35800352987.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1a9948c1bf7f0b5e45ac7cd44a0a1a88/bebogunosokelowasi.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e5ad0f5e---28235311734.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae990c4af---beredaxokin.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075b6e52dedf---xadetixuvozutovitowotu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9000a9c6---47705158100.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/naqhihjb8vtgsdkl8957c198ih/gerutaze.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/towotulevilunibuzol.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5020a20039---gevijevuranujibuli.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/26926279124.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/62168391801.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/18d696bde134294d8d93a667ae49ecc0/54272560081.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_off00015cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAB 19600 bytes
SHA-256: aa37f2e10a953d9e0e331c01700040e94a396f03be50a803fbd9dce01d3c3dd7
font_01_sfnt_off00018dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD0 10872 bytes
SHA-256: 07c35f2853eb497018691818bcf45a05a68c22b5de39fecc29786c4c9ae140cd
font_02_sfnt_off0001a6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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