Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eaaa9d2787f7b1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 14:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 169bbe7f1fde00ca4cb0260979cb8841 SHA-1: b3bffd3c5627dcf0b00b003a178dae53998e0196 SHA-256: f1eaaa9d2787f7b17505d99e0199a43c18dca7bac39bef038f799511eee76ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point to a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://archism.ru/uplcv?utm_term=picsart+apk+download+2018+for+pc PDF link annotation
    • http://atletika-pardubice.cz/files/file/50509309266.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/21024847986.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/78143008664.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/23704744455.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/59283544246.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff67bb247e---1736809950.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63268950417.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/30580979705.pdfIn PDF document text
    • https://keongracun.org/contents/files/61747211033.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/81948238495.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/59295873748.pdfIn PDF document text
    • http://fxlcd.com/upload/file/6898299300.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/pananonixuruwabufuxadox.pdfIn PDF document text
    • http://penetrat.ru/files/files/53386204161.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/78035260450.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/15390495805.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/19554996449.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/692e8c3c5cd40ee9c0627a72f4e93210/suguradu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614063a0adbe4---18100617625.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/27200544505.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/89959310046.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec3e90a391---zoxas.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/73349503508.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qs8u96ff7vsl1r1eg1ga52oojm/sununujarigadofozudor.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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 11160 bytes
SHA-256: 483ad08812fbe438b71045156414cebdb172d2118819e5af9b3bde43ef1e8401
font_02_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 14996 bytes
SHA-256: 2c1a34262fd57138853a04e985c3360519278d3593368fd4f1a6a4feab522a26