Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5da86215195f44…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 17:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59d33cb631f742bc382e9684a346cd08 SHA-1: e72779fc23a95bb5724bd7b8c323c6b8e77e7de2 SHA-256: 8e5da86215195f44064781beb2d6e40cf2d4921fb64a211c0dc9924c582eb503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a malicious download lure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. No scripts were extracted, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=mp3+song+downloader+apk+free+download PDF link annotation
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/12105693307.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wepovepaxugoturafuvixomon.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375761cf5f0---59918528787.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/9927468262.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b62e16a1b---logekijigorivimuluj.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/96087263722.pdfIn PDF document text
    • http://wohingltd.com/userfiles/dukexo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139a57e4a2f8---75362038378.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/34357980963.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/juzuguxu.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109160255071636.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/71377062687.pdfIn PDF document text
    • http://zerosquareonline.com/file/xadizudapolox.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/wonokosugojitoluzedebusab.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/gajamixivovomatititi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd024e6a40---43588852913.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/73194413470.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/nesulojuz.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nosakopovokupiban.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/22985352354.pdfIn PDF document text
    • http://wamer.org/userfiles/file/21881742096.pdfIn PDF document text
    • http://apple888.vn/luutru/files/totonajegu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/7927324080.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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 17992 bytes
SHA-256: 9befcc72e301a41e907d8411eef5bc96c18aaf1a03c94f73ab0f7cdf2d971a14
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 10824 bytes
SHA-256: f052195c3494e7285be4baaec83525071d80098b7ab8cf64d64b834bf80fdebc
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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