Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0088a18b2afed5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 05:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d027bc3290ee383a0be66b665aa8d39 SHA-1: e3940c267882f7d01bed6caffe4a104b7f5632e2 SHA-256: 5d0088a18b2afed5917a55a5ded82dc1aa9915ce3cf60c1bacb0f6c8c807d3f5
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medica-eg.com/userfiles/file/32119304638.pdf In PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/97052396992.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/43537078484.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68008539044.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/6olsjmkca5haden6iq01tt492f/86185998267.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fcc9842f37132f2c7f1e9aa8b60b8376/sugusazino.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kbmkv1gpoibccl65op3o30hmqp/dixarejidenezawedelinir.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gavumizelip.pdfIn PDF document text
    • http://119pump.net/d/files/84784055037.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/fexarasikuxapesuv.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/24300628774.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/pomizibesekopalobalinube.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/vojexozel.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/badaduzal.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/77606204796.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cd2e0b98b---wifogara.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/29628446233.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/jasebejopelap.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/2234897491.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/24450583737.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/18099587516.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/71797315258.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kemukixapixonilali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sadi+mein+jarur+aana+full+movie+rajkumar+rao+kriti+2017PDF 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_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 11156 bytes
SHA-256: 51a5a2a61b60c9dbefedb8157829dcef023fb7d038a365aa2f7374328259f0e4
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 19204 bytes
SHA-256: 98e13258954fb09fde75fa92fb56d8671e1ef4845032fe3e1408d1ea2c2e49c2
font_02_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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