Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c9c008f5bc8e7d…

MALICIOUS

PDF

94.8 KB Created: 2021-09-08 21:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1289e9cd9edc01ef23f282b6e680d77 SHA-1: 5c0f7b8948b4433d118d8257637b5ac9cfac0f2a SHA-256: f1c9c008f5bc8e7d77b49e9d9c6386f94d797d424c1bca94c1ff88fd73c3b3c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with several pointing to compromised WordPress sites. The embedded JavaScript stream suggests an attempt to execute malicious code, likely to redirect the user or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://infrive.ru/uplcv?utm_term=heatstar+swimming+pool+manual PDF link annotation
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/15716087733.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/32539182100.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/27680088041.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135dee112b09---dilak.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133448fa9595---68058133174.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/53696346441.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/78657065449.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/46754896055.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ffddo5hbn0ascpmct32dikbe3j/wekeguvaxomuximet.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zejufinajelo.pdfIn PDF document text
    • http://apart1day.ru/file/8043874604.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/vitusobuxeno.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/balidedimogodelilozazo.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/36266181413.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/66508084805.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090604544473499.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/29979491348.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5407e417---pawizo.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/25272185129.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/kefubepemomerugonewob.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vifizipob.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/fapopezudo.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/51839326402.pdfIn PDF document text
    • 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_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 17740 bytes
SHA-256: ebe860a15f3889e8f362376093f5584e03710668fcd2b579187c84a20ea589ed
font_01_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E2 10772 bytes
SHA-256: 077846760ace288a90fe94a103ca61b22dc86236f22978ab0f8c314a0a9e7503

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