Malicious PDF — malware analysis report

Static analysis result for SHA-256 732885fe49c9316e…

MALICIOUS

PDF

91.5 KB Created: 2021-06-24 09:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 826ce424d80fdf6a423468d9b372f4a2 SHA-1: e97f83d1b9b84e44c1570c344e67391d078b1010 SHA-256: 732885fe49c9316eca7866e7f2f2b64515fbbca5fadf12c0116732cdaa280c91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, likely intended to host further malicious content or facilitate phishing. The presence of these links and the overall detection indicate a phishing attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7854e365---rulilujulewilijit.pdf In PDF document text
    • https://cortopolis.ar/userfiles/file/12396336809.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/sufitaxe.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12ea92662---faxavajekikunizo.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/riretavekajajewokawov.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a7a4b260db6c441fc90093b2c4958ae5/sifopasegujawowujalum.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/11101403436.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/19261462599.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/90790189567.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/46282245092.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zarexexutizegexomo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c430c92ae3---vomemuvu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160900c3a792d9---61500876680.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/niwodixobuvugosopizube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=zoom+blur+transition+premiere+pro+presetPDF link annotation
    • https://exchange.adobe.com/creativecloud.details.10In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 13532 bytes
SHA-256: 89693c081d7413e399f316e88e7d93ec6ee26d4843b3a84047e9549f0343d412
font_01_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 5060 bytes
SHA-256: ab2c2d810bc84402f6dd292fcb44fb3a091c7893741b0a9ad59b84825187103a
font_02_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 11664 bytes
SHA-256: 7c43dacaf68b76254ae5009f753d13cf74dd97c30bb90d001d93b83a40bc1606
font_03_sfnt_off00014b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 16060 bytes
SHA-256: 813ea553b383b7c6403acaa04b5068532cc23c1b41448bc4e71f1b4196020833

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