Malicious PDF — malware analysis report

Static analysis result for SHA-256 831d7a749709ce20…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 09:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6e7609e9d5ee3c6d4eb4eecbee5c14d SHA-1: db59e846db6651a27eda0290e9e9524493003b56 SHA-256: 831d7a749709ce20084010de5380d5ea48d4567bf4409f3c443179f5cf4440c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=disease+resistant+transgenic+plants+pdf PDF link annotation
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a64l3iti1tsqcihr3p78hn8v9o/974369466.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4c7ecd5b---kegifasoliniseledona.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/beserevawegibuxenidi.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/vozepujegunip.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/37643094527.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2cbc1de58---62640139623.pdfIn PDF document text
    • http://jump360.co/upload/files/20210601163129.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/giworewut.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7645c2177d46059c87d20f65652f5a16/12606128124.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/nofatugusegitidafurowa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607633d12685d---nalefupiwefoliparopajigig.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/bufebibadageg.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/aea5ueuqrqhtl54ork8ge1ku64/jupodurubexini.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608085c2f081c---79265138701.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/70680491395.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7d0bef14b4e2542974f213f6ecfcd0e5/wofodesuligan.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cea9f1f3b68f70e4d5e7ab3c31d60e2d/70985091047.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/61036130022.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/xogikuvobasumutonazozo.pdfIn PDF document text
    • https://stopserv.ru/files/file/28078152347.pdfIn PDF document text
    • http://wjcopy.com/upload/files/68547735004.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/tekiz.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_off0000ce4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10676 bytes
SHA-256: 90ff32ec63fe41041c32aa373f6f626c46e55772658d1d0deadd4f04d98811c0
font_02_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 17412 bytes
SHA-256: 5df60a371f4c4bd152dd644f3c4dac92b0ee0d42ff0750c6556d506ef08ba431

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