Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e13e018b9061c3f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 14:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d8a92487d40b420421fe6d57358383f SHA-1: 553f39604a06a17113f79eb475f3d3e0bb6be708 SHA-256: 2e13e018b9061c3f8944919f22ee137e602fe33cd2413eabc212243a238614e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=fortune+magazine+april+2019+pdf PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e8fbc1a5d80da152988c47a42ec6e084/lipetavuvur.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bidifupaja.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/xoposufusus.pdfIn PDF document text
    • http://labotinnghia.com/img/files/pepivetadir.pdfIn PDF document text
    • https://mfdesign.hu/files/file/31373243812.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210807/file/16283461359200.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6c020c5f00b8bb34b5ef439c8d092c8e/60791980155.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/mewivaz.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/96321660598.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/wugipegokepofe.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2c904fb6---tiwomagexofanokokulobelez.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/nejebizutopisefujodu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611921fe8497c---fulenezibifowupuw.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/a1pfpfpd6r6t10pupgplf2bg7p/95912985324.pdfIn PDF document text
    • https://wagaskar.com/media/21809240106.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126ffe3745db---57220398282.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/55031075895.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/75833131446.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/92449221412.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/f8a7e7955cf87b489b14e9f71991a71b/dasasenawokexobotusuvoda.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mefuwazuvezok.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-28/20210728123826577442.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/70093034498.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4142b283---jamalazisanupuxog.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210811_112222.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/ponek.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/19980547597.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248fbc2d89---67998487871.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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 19264 bytes
SHA-256: 5c56461ad6f647e89e9e6f8c90b62752fb81dae17ec87a6d64f39e8c4ac9554a
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 11272 bytes
SHA-256: b4bc23929b8b9e847025aa48144bde92b72dbc5d1cc8a8f49806953361d7071a
font_02_sfnt_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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