Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4998b987d97e7ff…

MALICIOUS

PDF

106.9 KB Created: 2021-07-08 13:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d995f586a88f69e8b36cae152ef8a79 SHA-1: cefee0d452e2784bfab79684dbc9dd27cba6a193 SHA-256: c4998b987d97e7ff1c52f0d16231f882fe902c766c895f9fa0a5823edfed1373
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://matstravel.ru/userfiles/file/ramir.pdf In PDF document text
    • http://flexa.cz/docs/file/nasozutivulusaleferod.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160818d55af778---36206800864.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/viluzagebosejadoxesokas.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a802f75dec5---gavilefitedigoropotaxi.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/74904173851.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608beabe02c7e---felodumodumunuleb.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaa34caf0d---kokijawiluwovejinewil.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0fb45660---38752673616.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/44372862145.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/54846026923.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b839dd7f6472c1a6b0f7c4e87a295784/dijeromobiwuxopog.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106201656270176274vh4pwwhifo5.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/wepuzibe.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7fcd3e55c202054c3c67666eaf7c2ea4/52754545150.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f756b96cf---92428770077.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8279aaffa7ff2f4c7171aa0b6418c7f7/88897306808.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/rifubodewi.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9d98de90---nekakepupupetomomufom.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc8acbcbc---80683261854.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855d2425926---ponig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=concept+and+comment+book+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 10872 bytes
SHA-256: 2c25f40233ffe7ba2a6c8daeaa2b5fc0065cdbfaea294c2907d559cefae787e9
font_02_sfnt_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 22560 bytes
SHA-256: 7e3742a148072a779ffcd272d8169bb4990573c4ba7271989ebb55e5e704228d
font_03_sfnt_off0001792e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792E 20148 bytes
SHA-256: 8e68deb610889b438b0a405ab16dfc1fe7838b0e15c50f417b4a04a4a5441cff

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