Malicious PDF — malware analysis report

Static analysis result for SHA-256 949f56e29b37e909…

MALICIOUS

PDF

95.3 KB Created: 2021-09-05 00:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cf62eeb8438ed6b928e50d6d18ae8f6 SHA-1: 92a4bbca57dca9bdecce4e050a3b63250679f49e SHA-256: 949f56e29b37e9097613b1e85e5f718c68f5be2de08ac6b2f8c853cbb921e4f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to domains that are either compromised or appear to be disposable, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://studio5r.com/userfiles/files/53651105990.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ad21150---91803956099.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/68634135464.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/legubikefem.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6171c16e6---93983472972.pdfIn PDF document text
    • http://gangwontaxi.com/FileData/ckfinder/files/20210707_629722421E90AF73.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/50531541358.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/78075992261.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/26567750037.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/8638566396.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nudimaxemesupedu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71865a30c7---62560864280.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/jexixozesalo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076960323fb8---derobesum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094870f1d884---77433494174.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/tuwaxebusumom.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/98172466826.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3666b17b---15208270414.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/javezosaxabikawobike.pdfIn PDF document text
    • http://otczenacts.com/media/files/98812080761.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/wexetomakoweligisomikala.pdfIn PDF document text
    • http://01host.ru/userfiles/files/63635671704.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/goxodaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=syllabus+of+history+upsc+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 10912 bytes
SHA-256: 694804c1b333fa56aa93549a74ae8ed70af20bbfff1c3cac4a06cef9e41c470b
font_01_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 20100 bytes
SHA-256: 2f192cbac5a7f608bbbd9b31112d8c1064f8c036764b5294cdba9eb8c6887852
font_02_sfnt_off000157b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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