Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbd04392d69f1a9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 05:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40fdeffd1ed644284ccbad426f42f4fd SHA-1: 9bb663e8ef7b806cbf073d31eb94e9f75896701b SHA-256: 8bbd04392d69f1a957a05956a3f92ff91a53a5c997a9c1d0eaa99d45e7fb1851
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=football+manager+apk+download PDF link annotation
    • https://greenboo.vn/uploads/files/majapuruneva.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/norunubelejaxinubaw.pdfIn PDF document text
    • http://geodez.com/pliki/file/bifemopuvuzijitenepijo.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/4736695373.pdfIn PDF document text
    • https://paperland.bg/uploads/file/3945386117.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/saxoxogival.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/16485932586.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fcc32ad2d---ruvawezupejipegolufibasur.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/taver.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/lanatufisibuxuzovipu.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/63012399191.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/25f8161bfd59f9ae58e47b384147c967/zobojepedikujiwoxo.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xipaxina.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/fasaposobifexawodolak.pdfIn PDF document text
    • http://leguido.net/files/50615038330.pdfIn PDF document text
    • http://panteres.com/files/files/99400259262.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/54279474457.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wulixaloniwukefuw.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145247c54281---fegupedakuwoziv.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/20970473117.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pigurod.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/xovamuwiw.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910054720.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 20768 bytes
SHA-256: 14b86ec70e0ad68fd61155852558a4aabf5dfedde5a98984203226aadb7b89cb
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10768 bytes
SHA-256: 938275a24fb85b6caf04f02bf64e687a8ed21f0e70321fefd97a77d691361c82
font_03_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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