Malicious PDF — malware analysis report

Static analysis result for SHA-256 91aae4dae233fdc8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 05:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2367675f6882401661bbd26f8f68fad4 SHA-1: e67a390758ea05ee57686985a19203650089933e SHA-256: 91aae4dae233fdc89e448b8b57576018488ad6f26e665cac559cfbda230b9ac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs are designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/seganotalewu.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f395bfc63---sokor.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/61285557811.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/86577754560aaf8371c874.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/15988211463.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/88914994357.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ce6dcba9---68186115677.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec61d7964---84598190437.pdfIn PDF document text
    • https://andrejc.si/files/file/wixufogorozerebelama.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3862a8687dc1930ac812f1872ad8ad86/genipasifutotad.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae037bf4c3---59894049858.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1627795009.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1230d7f27ae561daa3ca98cbad04a3d/44816153215.pdfIn PDF document text
    • https://bczenekar.hu/files/file/7852577282.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b479fee0990---zivonopapow.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/56513615388.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a6088767f6764c3f3b05c613960e9bb4/48696964188.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/renalibotomuzavonuk.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d81344bde142d7492e576bb4a0c2b6a5/nulagonazaxuzidu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9ea8dc667b07a8d8164cdec2a0fd75ef/68655028414.pdfIn PDF document text
    • https://emmaushuis.org/pages/vovemujuterotebemiter.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/kulev.pdfIn PDF document text
    • http://mega.kz/media/upload/files/70899704886.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/xamawuwatigofigazupum.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc5f66493---sogukepijofikakare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=parts+of+formal+letter+pdfPDF link annotation
    • 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10464 bytes
SHA-256: 14e9457a5b72a5d359b1ad33e4b0ba296b55f72973abaeca44928f9a4b0c0368
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 18540 bytes
SHA-256: 3108b6ed8f550be34945008efa3c381dd205b754a69aaa3dd46f8d70d3017f28