Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfb3a7ff95ae6f6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 20:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4d69e6cb052a80771aa22625ac5765c SHA-1: 39793be655b870231042375369523b865ac36e18 SHA-256: adfb3a7ff95ae6f625bb6ff29c08616400e444bed3abd5f413c8d131680b254d
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crysiq.ru/uplcv?utm_term=finish+sentences+worksheets PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2856c51a356d7c697bb9efb460d45a2c/lemaxefila.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/65891563532.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/gififuzexijojuwol.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/luwigutuvuxuvesakijot.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210625_DCC20BE11BA2E401.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/tasafozo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b508bf3a32a---nawudenapedug.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/85698205252.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/52335643434.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/46670983088.pdfIn PDF document text
    • http://canvangdientu.com/images/file/52217086280.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/mabigedowufidetedeni.pdfIn PDF document text
    • http://cortabellanews.com/userimages/xaratavatonupawijag.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16129503a589ef---62790336630.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/14252881616.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce28339fecd32fc72bc6fdf63c715f46/86413521046.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/goxugoda.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/92ec998bef7efc17f5e790cb1ce79534/vatewetevoponu.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/39806692348.pdfIn PDF document text
    • http://industra.sk/userfiles/file/89538393294.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9f8e1585a---70306962024.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/28165598117.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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 10276 bytes
SHA-256: 0c1a85ecf6c3fba85399a221c63011b9dbc1f5482d56e0e8746090a86568ad1f
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 17628 bytes
SHA-256: 7fa81972a1511df4791c47c646002c4dbf4b429dfb1536d747fa0f00924cd3c7
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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