Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08bc0f1e6d08975…

MALICIOUS

PDF

86.8 KB Created: 2021-08-23 15:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 403051c7896d404828907b9ce6c12145 SHA-1: c6db1696cc8e079c65b745dc34c315483199caa1 SHA-256: b08bc0f1e6d08975485b8474590214dc6e3b60c72f60096c6d1fc9656cfb3b35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload directories or appear to be disposable. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted from this sample, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=naked+hollywood+male+actors PDF link annotation
    • http://bscartridge.com/pic/nefomed.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210820_6828ECA2102B2755.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r68kvubdv0ua63losv42dirb6j/kekuzopenezo.pdfIn PDF document text
    • http://emannsltd.com/userfiles/58289136389.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c907bbec460---didixeguvumujepi.pdfIn PDF document text
    • http://lactopad.com/uploads/files/wexalip.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/91520569870.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa318360df---77450216339.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c4a7ac5f---27729097456.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0b2dd90e---lutepuxowi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/dukozumamiviridid.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/404f7fa28080948b531ec887775a1726/rabobujopipufipafemukok.pdfIn PDF document text
    • http://amdind.com/userfiles/file/waselofigowuwobupujowi.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/fajejunusewo.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xokezumonibo.pdfIn PDF document text
    • https://onlinendttraining.net/files/senunevul.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/13354111762.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/oq5m24qsep8mmqil8p3vdrcr9h/19364116610.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210628010612149.pdfIn PDF document text
    • http://sushi-belovo.ru/files/gumudumi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dd841b69045796b3e53afaea039c319f/dawinidoz.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/tolatekoxipojokoxegen.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/bitekojasuke.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53ddb6a4d7---kifaniv.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wevovifurexugef.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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 17784 bytes
SHA-256: f60d92feb26628090bed692869125e7fd5c378424e55e0e54e184e8f21311277
font_01_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 10708 bytes
SHA-256: cce4c3aef279976b87dc04cecb73874f587414bce110149ebf0e9706d1c49c78

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