Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacc0226c75eae3e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 13:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d15c139f4acbc5dbebecedd4b95a71 SHA-1: 0e2ac4427e9abda6c11aa777a2922356645884eb SHA-256: eacc0226c75eae3e54418e09ada4cc8e5ec4c97bb0ad6e344175878de33c7f4f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are identified as link farms on compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves tricking users into visiting these links, which likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://huaku3c.tw/uploads/files/202109041837237630.pdf In PDF document text
    • http://smartdeal.pl/files/upload/files/58797690828.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/kotulekurowetefeg.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/tesokogotageluleseviko.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/dabosamedawot.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/tukejesifimajawuxedis.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/3739026409.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/1652806850.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/8489417903.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/32617049394.pdfIn PDF document text
    • http://lawngo.net/fckfiles/nojanizemuxarevusege.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/20669307491.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/42947427904.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4b13c127---35210340742.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/48321742942.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/fituzimu.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/83750215842.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210909_F9926F739AABC05D.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161396b0085bb9---6318676436.pdfIn PDF document text
    • https://5uempat.com/contents/files/marewamubunat.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/jevofela.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/viremepali.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/bobepebopisares.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16138e7039ed28---devodasijewusofugipej.pdfIn PDF document text
    • http://twilaw.com/files/files/kupusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=monkey+d+luffy+wallpaper+androidPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210906/16309423136621.pdfIn PDF document text
    • 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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 10608 bytes
SHA-256: 196f446c6c2e0b6b88c4a83e5b0e9d4f7054bcf2cbe03b307700a9c6a7038226
font_02_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 15944 bytes
SHA-256: 6d61ab59f6fb41d1350d6acfc346471667cd6f4e6ab1f25b0d3e47041a313eec

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