Malicious PDF — malware analysis report

Static analysis result for SHA-256 81023d274e2d8f0d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-14 16:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06cd9ff6a641952b4cc23ee48cfc9719 SHA-1: 47292917e576038d57f4242556b6777a588ad135 SHA-256: 81023d274e2d8f0dae79b2a389ed1e48def0b2db4c1dbec8bd914dd0194c2fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as lures for phishing or malware downloads. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=last+day+on+the+earth+apk+mod PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7e2590ff---63170441259.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/sazizadumasukuridego.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/66746844198.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090212055773499.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/74481073159.pdfIn PDF document text
    • https://mcsfood.com/images/file/41456338373.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/lozusodogonu.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630845015_3be2136ab4.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gafizakor.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/92927242785.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/61b73443fea42919b043eb7228596cea/movesefurelalevigi.pdfIn PDF document text
    • https://mkontroll.hu/File/miwidutu.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/58208788003.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/nopavi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ee62808e---nusisifoboropazeva.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/17668926405.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/24656487740.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109111710571148.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/zerev.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/22096659783.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/67145983252.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/71566189365.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109032059072088.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8e7e4db1---renuradudeten.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_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 15552 bytes
SHA-256: fa3d5a9741449cc894211d11153673ffd2956a71e053d72594d4ad07e17a8eb5
font_02_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10684 bytes
SHA-256: 096896d3cab51e78a0c4276a3899102cb510f7d0bf24cd3c4075d1dd2fb160b0

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