Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba602b4dc4e47b7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 14:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f34c4deabb37c41ee625c2872956d6b4 SHA-1: c53b3cd9f08253a96278b508211b96564cfe23ab SHA-256: eba602b4dc4e47b74458b97b4b7d408a0ba1111e192d886b68fef81d7225a219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to disposable or compromised hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007.

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 http://distant-property.ru/fck_editor_files/files/vadomuxufekekisaweji.pdf In PDF document text
    • http://shiokuda1.com/contents/files/dodegiralelepupe.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/70548955339.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5e38a3547a2a053c184047b0acd97a88/digatosalewenewupab.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/poxamevulepovobigefexo.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/rimufu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3a91f7d3cc00db1a0a9f3d71e92782f9/66314147662.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/juvoduxefateziguxivetazo.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210902/file/16305998402168.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/dejokenesufixilu.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/19149819183.pdfIn PDF document text
    • http://wsm.hk/images/files/kikedima.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gotukomam.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d8785e8b---zadufavogemumofopulera.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/zolabidufij.pdfIn PDF document text
    • https://remini.hu/userfiles/file/zuxosubuzuzan.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b2537879e08c415e299c4d49f60ee544/sirujagubowizowad.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2e4050979ebda51f34e5a44103f16f0e/8575470290.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/5304965391.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/58324633788.pdfIn PDF document text
    • http://chieucoingason.vn/files/safopubobiz.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/rezitebizibixunemapireton.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/satalago.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/92719883687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=speed+night+3+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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 10864 bytes
SHA-256: 9be216e83e1d4c0e276284173fa24a5099efeb8add0a516c4c9c6cb7320484cf
font_01_sfnt_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 17172 bytes
SHA-256: 832948f7dd21a0108562d866331a9f929f3d984475acc496c4ccee4f7957fb9f
font_02_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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