Malicious PDF — malware analysis report

Static analysis result for SHA-256 45714ec81a5fa728…

MALICIOUS

PDF

97.6 KB Created: 2021-09-01 23:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3dd2550e7866e27e8b857985176cad09 SHA-1: a2894e19b363ccc92f4e65facb23f4c77554b080 SHA-256: 45714ec81a5fa7286e4c3ee8b8d1024ff22972630a5abf795cddaec6a7bc2399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve as a lure to download further malicious content or redirect to phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=l+and+misa PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b0b3ccf1c2---fogikelanolavekudu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/36748722924.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/4042595657.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/pebulopewipotif.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hk7154nofrlcvjqslr1ekqbudi/jerufoturinevofuweg.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d551ef27f9---tagezuvixuridazit.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lazisijimitejirenuk.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/kelojerotujomezivaxi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/98048633731.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705fe2b5e8e---14865583168.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/61458638251.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/rawalalikirumodibalanule.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/15737733924.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa665d6028a---53721350579.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c9c908d1e1f2d6c8152b3c06270f7933/tigunumawunuwivunepe.pdfIn PDF document text
    • http://scantech3d.com/files/tugilebufipanu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7088b649d---25773502504.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/8876604ce6514c0f4d9d9db74f329037/62346549580.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/08/sefapezizogaribogigibalen.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5b930814a2d07a06f796bd69d740f244/mipulemibigavunuxiselera.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/1030572006.pdfIn PDF document text
    • http://kleiberit.ru/files/file/bazefuxire.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5m7kut2km78tbudc0ung6k850/duludepagoweput.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/55299694221.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127e87f38db0---fazexupuvovakomebefakewi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 9868 bytes
SHA-256: 992d68f48c93c7f312cf78380c27163a90a8c610f2d7e5cbc04ffaea800d7a27
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 1804 bytes
SHA-256: 3e0df04775994f06af00dd43b182878e5699af55e11d9568351e5f77a1858c75
font_02_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 24256 bytes
SHA-256: d7665f89fc0b31a1306bb100e444c1561e00c7e3f3c7ad4607ee06156c841a0d
font_03_sfnt_off00014798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA9 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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