Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb24f4e761800fc2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 04:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af62b44aed602651a5b17804d4df9668 SHA-1: c19884ed2495da82203bd352f804d8076847d10e SHA-256: eb24f4e761800fc256ce3eb85bc0ce133df22f921b88bdf2fc06f715373e2206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bowlingkillers.com/imgdb/files/36392123892.pdf In PDF document text
    • https://purefeeling8.com/data/file/dapevonade.pdfIn PDF document text
    • https://luminex.pl/upload/file/worojaragafifubaw.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/pujoruwafenolokina.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9e653e93a6f8bb13ac9dbad600c96a2/28608199094.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828e5ee7ec5---ribosadarixigopa.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kuvirevifuluk.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/xiloxa.pdfIn PDF document text
    • http://stl-hk.net/userfiles/bedukadixepukixirot.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/99251349388.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/rexizutugurekipaxuj.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fizev.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/94300658008.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/sisulitepevemamamo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0p03e2rkj70ehclrp44h30mj84/bisopimox.pdfIn PDF document text
    • https://dm288.rs/slicice/file/49245753889.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/94820889637.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mf3q7msis4an9rjasm6d25c90h/jetepifopepazitux.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4037e450cf---tokawedobu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7a569f8c---9189391045.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7g836fq9q8b33oaah82q6480qp/51858405226.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133193f970---zozopibupovopurabot.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5fc5d371---datolelumekefowirutuf.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/33058720371.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/gelanorewapefatogigev.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lole354cs89cv3e2i1jlma8vqp/redogijirekinafonadox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=convert+word+to+pdf+and+reduce+sizePDF 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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 18160 bytes
SHA-256: 34b4918fd4a585337dab2bd3435b2ad5f76d19ec381b1a4fd5e643427c65299e
font_01_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 10908 bytes
SHA-256: 3bbde50a7d8bfc50449bf6630e7919b12f8248d24b50073ea0f69f976ffe7380
font_02_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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