Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bf4a6b0ffe9fef…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 09:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 983cf79e7b0af1137be251c2302b6f1e SHA-1: 18084b6db851fcec498a500cd1669b531bd4dedf SHA-256: 92bf4a6b0ffe9fef441f2fc448f9218c1c662076ed58adb402950c72a3046f1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an effort to obscure the true malicious destination. The presence of embedded URLs and the heuristic for a link farm strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smartickgroup.com/userfiles/21429810769.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161402bc96b7ae---17031429931.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xokaratojawuwexadixeva.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433cf7e141a---vefadariwenejezeb.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/wugovofijuji.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614288a618483---tanimugakuxamapisozawev.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/49776894693.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/lologutabubupenow.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/ganusulazisulopasejo.pdfIn PDF document text
    • http://tzsunup.com/upload/28396060740.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/7887829096.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/siladilugab.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nisakakoraxaz.pdfIn PDF document text
    • http://soc-in.com/data/media/files/digevofelosi.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/ketunopewinaga.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/87362415905.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/40122142444.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/rezavugalixulanafox.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353e3e1ba04---liwomubagogibam.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/famonafemediwexave.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/lepubapo.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021951833238361.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/ligosupugipufodufu.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/gasev.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/kawole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=boom+music+player+mod+apkPDF 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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10832 bytes
SHA-256: 8e623f97d3696070229187e392193391225c57120161f9f8ea30621da02caf10
font_02_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 18264 bytes
SHA-256: 9be2b023c384da95779b187062972cf8a33878a58268502566193d674cc6e237

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