Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b2118e2ffd52b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 17:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36132d9b1265cf09844ae47b9958b85e SHA-1: 0b30be4f7c7e6e49414859fe3978e2205539c74d SHA-256: ef6b2118e2ffd52b692077a8c7cd46591d822320d8355edbd025ada8fe3844f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://partnercable.hu/files/36731431338.pdf In PDF document text
    • http://baovevietnam-vnss.com/upload/file/73890117137.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/xopalidixapi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/wizutiloxazejo.pdfIn PDF document text
    • http://packamate.com/userfiles/88383939090.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/73156640800.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/24799553594.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/luripuxaxo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135096ec50b9---82310825599.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/toxisubasosivikibizelowi.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/gaguw.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/zujediwaruxiwevisejodo.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/40417596331.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/dkjf4rn88bnfk9c2bduckjlohs/26531951250.pdfIn PDF document text
    • http://zeci.nl/im/image/bitobizev.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xusijawo.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/jajofazakojusanadivo.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/22935865891.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/41064476799.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/45492692511.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373beb780b4---96716737089.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/81054252414.pdfIn PDF document text
    • http://annabarons.lv/files/files/dunasujexopuwalarosulumox.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/tutovelumefusugosekiki.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/polesutoselalubevapulufik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=drift+fanatics+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_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 10696 bytes
SHA-256: 4ac1402914d55468138b20f958793817e58c560087a79f3ed0f1fe119cf46a6c
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 21688 bytes
SHA-256: d03f5fcedab80dedbc15df25f81474e5e869e0c0dff30f2b3c036c72682c748f
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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