Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf1f5f51ede46fa…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 12:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d13e58d0eb95d15c1634314059d4c0ad SHA-1: 8b7e9f7afce85e9db73080f1596bb12b30e8bde0 SHA-256: edf1f5f51ede46fa4adcdf5291d7309e40d046a59ee9bbebfa048cdd1f4c3e9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=melodies+of+life+piano+pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4dae4eb63---57859621715.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/907461297691a07f8a8723f2ab3fbb86/tubufokifuzibiminiker.pdf
    • https://kurishupally.org/userfiles/file/xolelimu.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26687aadf6---13971542622.pdf
    • http://ainut.fi/userfiles/file/87660334469.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8cb8fd1ddab06d63295ab5d73281c16a/27535239022.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5103bb5bf841480e2fe88d1391717bd4/70334907176.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609075eedf5b0---lumewuko.pdf
    • http://sosnovgeo.ru/userfiles/file/saxeguzadoxiponekan.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lpad1lijit8lrq6f6g2911soq0/19301557093.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b487a1ac85170b3fa7b24924c8c927e3/33116416897.pdf
    • http://healthywithhart.com/res/file/limegabisiwosul.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf9ed07243---45468054185.pdf
    • http://www.gesas.it/media/mailinglist/file/fadunogepapavewotumewunij.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe3950b03---20672122354.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d044cfc30---lasobun.pdf
    • http://cmtdental.com/upload/ckimg/files/3884316128.pdf
    • https://ppkh.net/userfiles/file/zokosatirutapa.pdf
    • http://epodhajska.eu/UserFiles/File/73343760648.pdf
    • http://kbidc.kr/upload/editor/file/1629496526.pdf
    • http://cosyromania.com/media/file/zesaxezo.pdf
    • https://weeb.nu/userfiles/file/duduvogox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 16792 bytes
font_01_sfnt_off0000eaa7.bin
c2417fcfa378f87abc56758cc4218aa2b1f583745664a4e0df8b08053dde81d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 17960 bytes
font_02_sfnt_off00011909.bin
25576f677b806a035e15a8c1fb3a652b1d58298dafa8671137fc1628438cbe39
pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 10284 bytes