Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b6ff3d1a388dce…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 14:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f6108907fc7528ea2348e814ea14349 SHA-1: 312b5b29525650cb4d8828858f518df1e7cac32d SHA-256: 86b6ff3d1a388dce907c1aa12cb135c48a2c3f611ab6a71dd507a755f9e09b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The primary URL, https://crewmak.ru/uplcv?utm_term=apply+for+driving+permit, suggests a lure related to permit applications, likely a phishing pretext. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=apply+for+driving+permit PDF link annotation
    • http://banhangcongnghe.com/upload/FCK/file/44364946482.pdfIn PDF document text
    • http://shosholoza.de/file/13761695275.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088b095a31ee---41017112177.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f2f2a2aa---48976897736.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5088d223fb80ec2ca9b04dfacf2241fd/29635600646.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/zibipagejekin.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4579cf2811bfda2625233a6a7ad1d3a4/83564384757.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aoijrfa3jp5ba9hag7gv1p8d87/gomuviberokujunitolozoke.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/bojizotavuzupidajoxavezar.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4lmbig2hm96kf1m8sd7hhfm5l4/18220143301.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/zumozad.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/63718qspdteg9i5kcjvjrk5eii/51296891010.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/patulafesorasofeberi.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/vinitabegunigowobunelup.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/wopotovadabopiweriku.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bae6e62ac---pozivuzutu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/08947ce8e5f771a1dd0e8772c28d70e5/94017251340.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d02246e61---29093489578.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xawaduvibefiwizuz.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/jobofamexekebinaral.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc37586fc5---nobixamoguzamonenov.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_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 17852 bytes
SHA-256: 3e8cd303995251c1da608dc447df8834b1b5a498d0a3c5f05b9e61124ecb78dd
font_02_sfnt_off0001458b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458B 10672 bytes
SHA-256: e3a997971b8cb02120d86310bdc8e7ddae876948233bee428c7dc63ee64e0386

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