Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7c3ad944ca7d9c…

MALICIOUS

PDF

83.5 KB Created: 2021-08-20 05:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf502e350f9034fba3be791119b3d781 SHA-1: b616ed4c4a7b561fbfb4fb8b1e1ed0368aefe81e SHA-256: bc7c3ad944ca7d9c7fc61d6f1ea78bf5a98776911250ec612217dfb4413b13c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dced4d337ec322c3a5ee79de5ab86fa/87106971947.pdf In PDF document text
    • https://nguyenthelong.net/userfiles/files/kalejebinagepu.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/gonutobariromiwugokazid.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5a91111beb55f59fcea717b23ea53612/vuwogolurugosoniziguwu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/brhqb846mvp1enhbkqtdqroam3/jupufibolawowevi.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/xifetakek.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwegidapoxazasalo.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/tawesepujelikule.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/96006902342.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/jowevotu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/606c4eb26b87e625f3fc80dcd46bfa5d/1934707348.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/gatawojikotirexuruva.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/84393601940.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d8e6228ddd98bac39b5d4b6d1da04a54/konemesasaxuwuxakigife.pdfIn PDF document text
    • https://akemi.ro/hirek/file/85094725400.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/61b93c5bf81c0123547bb855af318e67/11175357123.pdfIn PDF document text
    • http://isosklo.cz/uploads/fewupokixubudug.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc87b9056b---serisubapidigeva.pdfIn PDF document text
    • https://totounited.com/contents//files/julolesajisala.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/91181964395.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/cc35d664c9d0c84ea8608520a8f40fcd/wuwuduxesoloxexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=catalogo+price+shoes+2021+ropa+damaPDF 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 11184 bytes
SHA-256: 443c438e46b713725fcd230f4797f6f053474612705748c7b89de14af53004d0
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 18048 bytes
SHA-256: a9197a254f9b5eda63a5c935c86588b124115480b13387618f0d0ded651c15eb
font_02_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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