Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e4a9d81cfde318…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 14:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43daf9153840b35fb483950a85f16870 SHA-1: 82596ad1aa3137c5176099da8bf007b7fd5e4ac2 SHA-256: 72e4a9d81cfde3184218b873573e62adb360e4060ae992f46e8771ebbf2c702f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and embedded links align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://boothbayharborshipyard.com/userfiles/file/tomoxodis.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c5f1baf1---zakoxegenu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f810d6347---8401634069.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c7fa1fcbc39cd45a39c96d2a067830ad/supop.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38519bd6b---xepibiwazuzunefobev.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/zitadexefibigatipokatini.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/165c809d1182300ff24cace66e6f1cae/30738944249.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/46945544992.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/sekupobovogo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279019daaa---nusonerori.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6q47kpipcugqmmpo3g94t5alb6/46600770108.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/tiwokepuvezarilifimasuxu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dv6i3agkmtn6jadqjtbom7srte/9531391186.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210629091655925.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/446f7878b70db84858a58435c1df55cb/98396566249.pdfIn PDF document text
    • https://termofriz.rs//files/bikukigurupisumerimatef.pdfIn PDF document text
    • http://darstin.com/userfiles/files/24047456848.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/111143218ddd00b0595860928c2f6585/jufudu.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/bobuluv.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b0373385---99387676769.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/niketemezolalif.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/wumapat.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/320bea00809d29f2b875aa2841612a03/rusakefogesaxifi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/12ff940a124c205181fec447131a6f50/vituzufamigef.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5341d97c---24772287028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=according+to+the+medical+modelPDF link annotation
    • 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_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16764 bytes
SHA-256: 3d75b035fc13c2682935bb2e1118d6e3430b7678a17f31fe8d83690d83371deb
font_01_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 10632 bytes
SHA-256: 73b2bac2026b546a05ea8239f31d590312e658a112f2902118c340e858974287
font_02_sfnt_off00013e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1