Malicious PDF — malware analysis report

Static analysis result for SHA-256 caab280b7229ee22…

MALICIOUS

PDF

105.3 KB Created: 2021-07-01 16:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a7e1d560075953f632b5e5906fad94ac SHA-1: ad4a058a91add35bbff46aa3a628d41de80432b9 SHA-256: caab280b7229ee22010e4462b4baf54e4280a7528ad33d05bddd9026095755fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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=watch+pulp+fiction+online+free+with+english+subtitles PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf07704065---fofejomevawuvubadow.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/31136e247ecd399170cb82b47c3427d9/zunati.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87032104074.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dgd1ln17gst4h6g1f6ul67fd97/65141554833.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c172875a1---jalenutegatonazolevipilu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tjtqmtr0k17sqkd8qvc69po8s8/zexakepomap.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68de3478e---28521307035.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c755f72546---tebolirixazujuwo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fbfbd78c---tujesetewomilaru.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6b75a13b---17741360977.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/koradifuk.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ik03v48spvabd2vrr8337gtprq/resanogisivamimifani.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/gevanu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b893b9e928b---xozumeju.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/67732392558.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/kikomawos.pdfIn PDF document text
    • https://hgb.se/filer/file/43909860669.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/7aacbec977a36fb511b4718408616246/59822792673.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/25553345339.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ec1245e84e8e928d734fefda445420c4/69887970539.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b98409a8---56711565858.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/72967600274.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8ba724c1d1798aed054cfb8d40bb4e4/89712429779.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/q320itee665h2g3oalbq1vu778/nixetemexafezolawiwutod.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 3604 bytes
SHA-256: 39d73470c9c525c78ccf8c0a77c92677087629445d184915c670f01179bc3b64
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 11080 bytes
SHA-256: 1c2964381792fc410e59a14079a81735d9654f870ec57127bcd8299430823459
font_03_sfnt_off00014c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7D 17104 bytes
SHA-256: b86c72d2281df14e9aadb50896f3c2f31ef10e558eb560fba9343a673170a85f
font_04_sfnt_off0001657a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657A 18720 bytes
SHA-256: 4355e71c727954ad4dd3fe086e79715aa64180235733b31bafbc5ace1d517381

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