Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8c3cd70c243cb6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 08:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 899d4f059502862d07c5fe97b9af7440 SHA-1: 4ae9e72b40d791a40b1fbed8ef1421bab04d20cd SHA-256: 5a8c3cd70c243cb699cdcd690a1371e3a0be6342d7daf9b1cdc1fa87b8ba2b9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on compromised CMS uploads or disposable domains, forming a link farm. This suggests an attempt to direct users to download potentially malicious files, aligning with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://nkmate.com/FileData/ckfinder/files/20210906_4ADB19C949F94C8F.pdf In PDF document text
    • http://plkorea77.com/ckupload/files/niwojibifesaber.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/14612682169.pdfIn PDF document text
    • https://kapefashion.com/files/files/15377281737.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/21568621026.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/66591541639.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/rupepotolagomup.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/80566811392.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/digamajo.pdfIn PDF document text
    • https://ewt.cz/res/file/85671731457.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996474fbab---38188722971.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/15526934978.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/zaneduxixogajimujodo.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/63560070141.pdfIn PDF document text
    • https://nevisnews.com/userfiles/tukivul.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/1091401358.pdfIn PDF document text
    • http://metzlerranch.com/userimages/gaxunavifuzitalimeromax.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09hml02elp210vp02j21ddhpae/60849736042.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/92640669146.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/gifexa.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/fexaxavaxovevoravupevux.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/37216443034.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8906279a---9830513022.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/65626042700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=codashop+download+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_off0000d62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 17868 bytes
SHA-256: 2d4fed0385377044a7d21f581a273c2df88aa4834b834f249df29b7f89b6c7e9
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 10276 bytes
SHA-256: 40a63987340edb555c99b15fc122545d88e9a69474afa2f898d9d4c42da460d6

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