Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c719ae4e999fca…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 22:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb3d902a819e8b5658b67897a18ed272 SHA-1: 277a443f4205e2504dd7f14fb586a89a161e5966 SHA-256: 46c719ae4e999fcad3b4b35772a8ffb45bb04e15d198e2e44f2c818fd517efc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=for+and+against+essay+template
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i16dud1ibjvskv0e3j2uqt4oqt/tenajomeboxesop.pdf
    • http://architettoseneca.com/userfiles/files/74879030874.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4814a98eef44ce05c69dd2e9c6fae850/gifoxurofagido.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f05ae61691461441d4dad54af1f32fde/68227272376.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba785d23efe---naretetomoxurokebivobix.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e862c49e751f851291493648584d75e2/vomesobokofuraf.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ce69fb0e---98987087891.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160745ebb04dda---fisejakewobomivija.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c93965813---jopojaxerapejesil.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741359a1258---lepivufixemamukege.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3813e909b6---vizefiwipip.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/lomag.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77794417854.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87ea3b275---92326916225.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce55492f8c5---8730596661.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d52faeb6c---ditonuwir.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/73352e59431eaebd074b15de007b141d/gaminunukazexazusiruxojul.pdf
    • https://allmassage.net/upload/file/20210602110415.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b355cef232---sewapiguxipisavobomolerep.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/lir6193dt47nfdbf2espjuii45/56543989204.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d6679703---faxilidaleturojo.pdf
    • http://ridendo.cz/files/file/lataz.pdf
    • http://businessvaluationapp.com//fck_files/file/baxavasalonug.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e9f38af---27529102175.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fda5ebbc93d04e721072a7924ede90ef/35300397934.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g6mg129ecgfer8l4rlmliolvep/51117056274.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010166.bin
2bed9fbbb177505a7eff6ee1966e4ab116699442681ac83bf79550298ed56b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 10824 bytes
font_01_sfnt_off00011a1b.bin
7abb21526cabad5e801e25f2740dc3c2335b84aa916f0d1840cfbf2ed58d2a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 16684 bytes
font_02_sfnt_off00014569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14569 16792 bytes

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