Malicious PDF — malware analysis report

Static analysis result for SHA-256 d096a240bce44e93…

MALICIOUS

PDF

90.4 KB Created: 2021-08-23 12:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94d3ef9277dd5623ed7f139d370b98b5 SHA-1: 8e65fac50e1e91ef487b72e31aafe8aa2f976cb5 SHA-256: d096a240bce44e9347bf8211c5c181cab9b5bf947ec5be492686c73566502504
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the links and the detection names point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://bjbtrh.com/files/pic/file/97283203082.pdf In PDF document text
    • https://armenia4d.com/contents//files/1953647406.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/13791595100.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/18773822014.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/vitaduboxamawowijix.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2020ddba1e---zesefo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pikufiwilo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/54ef3c8185b8dd5546e6e452917840bd/48568220078.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cc240ff1873a3062aef99bf44635cde7/30908539544.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/71925654594.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/28557826836.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4347000a2c06abd6b52ba68575a8bb53/78733014862.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/11100536984.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/14326356980.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e025f2f1---kodifora.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/92054274211.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cac438bad---najupubinorufupi.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/vijanupiwawaf.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/60678224589.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed3eea523---narotawojiketobevusuk.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/5932984240.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/88269717021.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ac914e64---35916649003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=python+programming+in+context+3rd+edition+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c9e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC9E8 21168 bytes
SHA-256: 08643904693f288df89266f82f13adf07babdc602c3307e3e044ccb73d1dfe3e
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 2580 bytes
SHA-256: 9e853fbeca3ebe319862b4dfdbc5af326eec1824395e69138c0a4cc0df31ef50
font_02_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 17368 bytes
SHA-256: 2d31c65b0fad261c10d938f5e34e60f37e92f8c183522debf59e787620fb25b4
font_03_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 11244 bytes
SHA-256: 700d6d44d5531d0108bf73909ae323cde6197494643dad8f4c55ac46963edafe

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