Malicious PDF — malware analysis report

Static analysis result for SHA-256 3880a5b77fada4e6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 18:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53b8ab033528500a7d7b5e1a8491bc8b SHA-1: 93a2cc43363385a776f44a2ab154da99933bf3d0 SHA-256: 3880a5b77fada4e62873f3e93589e0455ec459869679942f801ea6ba9c30d389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to redirect users. Several heuristics indicate the PDF is a link farm on disposable or compromised hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack vector is the embedded URLs leading to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ketchas.ru/uplcv?utm_term=teaching+productive+skills+speaking+and+writing+pdf PDF link annotation
    • http://tencanpowder.com/d/files/sawivupulifopajun.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/veradanu.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/5564838243.pdfIn PDF document text
    • http://e-menu.hu/editor_up/52962867643.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/7b6fd184fd1f674e4ecd3bee511da78f/xadizisunitoxi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f00148dde1e---konomurelake.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/tuwabirojolopemoj.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3732064917.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210822/files/20210822051432.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/37102213781.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210704_221315.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0v8skvv352ij0psl8mbs94hfg0/68223597705.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739340daedb---64063664350.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d2a7fb7a843c29f1fdb951e8ccb0a753/83304091681.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e60a55af---46245907191.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/sulixudojatojoted.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/ripadisejizelegonimosuji.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b753321cc---lewez.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kegakejemarapuf.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e2f1bb12---sasalalewebako.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/93548727252.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/mepetuxavosimojigo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/71277771928.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eb5cee99b---zawizitojaku.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/37489988366.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607087b847cc8---47274123192.pdfIn PDF document text
    • https://samowar.me/upload/file/wirototarebeperogi.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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 11208 bytes
SHA-256: 09d8420bc9b4b054371a4b2b73fcddcd213fb060642fa5b88d10a1bdf13dc2bd
font_01_sfnt_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 16988 bytes
SHA-256: 19a4dfb440d4eabaccd251fcf13e80d90f79ef598c6a6cabe2c836cea05487da
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.