Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68bd8507b2f070d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 05:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 949ef5503aefea94fbb99a33fcf436c5 SHA-1: 08a430ec26a4f385ae200b83bc6d998a4c43b0d5 SHA-256: c68bd8507b2f070df6ff83df13d82bd548cc3cc7b42e1dd04164d91f678d5616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://colorfusion.us/admin/images/file/molinejunifogevugomag.pdf In PDF document text
    • https://mimpiindah1.com/contents/files/17784776676.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d5dac27d38bc28d2f9bd5fae557fff29/fosonititivibijofulut.pdfIn PDF document text
    • https://gornjastubica.hr/files/mivuwaxiroweledoletoruja.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/temavuf.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/18799545976.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zosezufojudosovatopomi.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/zisevatemosafadabilulolak.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/temagawajiwisiruwozanobe.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/43183050436.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jm3lrq2ub2oa4faqoh3se7rrp3/87041264628.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210905175840888384.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/gapezet.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kupukebazelejozijizumi.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/mapabakafe.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/pawuwilaxozexarobad.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/jexoramawobenuvulizu.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/25431766975.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613934c242aa2---melixapudu.pdfIn PDF document text
    • http://zubrcup.by/files/files/64277300334.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/wiropiseguz.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/66503400845.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/rimufakolupawon.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/wudanipuriwepalamobus.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/3386695025.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138de5c0ceb0---33132409673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=17+proven+currency+trading+strategies+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 19124 bytes
SHA-256: b0f075791c6506b61f1bffbbc3afd4d33e7520dfe009e898cf91c514fd302119
font_01_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 11168 bytes
SHA-256: 91fcd77a2df934a0d6c8b1bd9f237225b2e588193d093721286257b3692cd448
font_02_sfnt_off000130b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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