Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc33d0798e04c77…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 05:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 862f3810308b36d25d5964504d037ee0 SHA-1: 3a5387362eb0fa89e0e16c6542f82d4b71b1c5a3 SHA-256: acc33d0798e04c77bdb149f4dd9a5989c988198aaeaa10c0949d8d5f2db0fe45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external PDF files. Several of these links are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://podushka.by/files/files/26652263835.pdf In PDF document text
    • https://actaviaserica.org/board/file/files/42073175069.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/42821201803.pdfIn PDF document text
    • https://suruburi.net/mm/file/gidunobotosekef.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109071228282200.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/13859136777.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/30300402736.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/mobupozonap.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/50022786473.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/nixivugogube.pdfIn PDF document text
    • http://baove24h.info/upload/files/34782041185.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/61640248937.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/kexeje.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kimujes.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8186d4978---zamosaladefawoxan.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc183df6d6---75431748744.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe5f4d87c---34041070532.pdfIn PDF document text
    • http://eventechsite.com/files/files/60720105938.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/85854983206.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf81af907---15353554130.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/25322324484.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/pojafilegevejiwiwuwasanag.pdfIn PDF document text
    • https://krusomying.com/data/file/6296887493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=geotechnical+book+pdfPDF 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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 10720 bytes
SHA-256: 1de47c6896bb4b8fdb94892e5d7cb372ffe344b80466822c01eba75fbb52c4cf
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 17400 bytes
SHA-256: f0ba9ac6df196b3defde02bb105d8db89db07fad9b4a18c98bef9eca827c010e
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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