Malicious PDF — malware analysis report

Static analysis result for SHA-256 41041fe8d7efd1a6…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 03:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8590db30e39270350e772a342806b94d SHA-1: b6ee5eb4dbc640757cc143726cc25f7d42e651e3 SHA-256: 41041fe8d7efd1a6b09828a8b4e0cd0d73c9fb6270b858d8f2e904514cf4d53e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=when+was+the+first+camera+created PDF link annotation
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2211f354b8---13954205562.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wezolosave.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/67233413932.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/27297996325.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/448dc9270504c1f78a93e1c4502a6d08/53287101295.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/nuzepajefisuli.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/tumivebimami.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/tagepisebemoso.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8a7d637c---zamivolijanam.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2ba1f7dcd164056fb6af3f9235bc9784/62630604061.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/86092781388.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a631c71b1ff---84909831463.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/diruwisavofel.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wazelazemotemivomisodap.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/2739448319.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5acbec5a84df1794a5ba8863145e1d20/47848848199.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078a215300ea---wuvoxipuroluduwu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c6vbhgfpajreldeciqlv2fuve/nabafoped.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9c3130b1---ridivabo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/53b9d41ff97c06fbbfcc4e22cecbfc5e/vujivagawugeluligogo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4143faf6---derikewivekisumimuwifibes.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/vevopajizaluxoj.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/najulosegumud.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 17112 bytes
SHA-256: fb47689f7448dc90261f59cc11aff18c1c6221b991bf8e1ff92b8727fc65ff82
font_01_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 10656 bytes
SHA-256: 186d5931a120dc3a06ce8bf38f9c8016c823cf16b42c51a8f89d4ef579ce66fb
font_02_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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