Malicious PDF — malware analysis report

Static analysis result for SHA-256 765037d3fa617c12…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 07:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8e256ceb86c83c7eb93149d4eb43121 SHA-1: b28b4c65b46a204f4facc715eb6d41d26ba2def4 SHA-256: 765037d3fa617c12b43a16220eb0bedd0f33f908d83fbe3acee0019c332b9e80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ca06253e55c1a49417ce3a550508bc9c/70806793302.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/wevemiriwev.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/s43h2128rt7qp25f050p06vjc6/rigamabujobumomuf.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95122423883.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f7227d63d90da93a93f3bc64648cc9d1/ganedazutudofawevutukel.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/bekagekidarinutax.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/reluzepusugoxowipopisob.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bb562f4f---83827858712.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/598b84ac4b7f718b7b4fb9d6b8eedd5a/50402981685.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/kisakuwetizapovubupe.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade3eec97---41617350737.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6d7d5ac8---nopim.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/xuxagenegekulanovinid.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc0312c97---moxurumusosebepav.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/76e7bb6bcd716f524b8f36add64f15ba/vitubisogosegil.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/dudizumiguxowunazoxokok.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xesurimotavubaden.pdfIn PDF document text
    • http://www.puhito.hu/uploads/zularulopuxifoxulato.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6c7c58b6---latitikeparowaka.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/babafotikazov.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vewizu.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/92985927174.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/24c2fa170d75ef394f7c99e2b61ef1ec/54971610233.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d84b3141---55527396886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=converter+pdf+to+epub+online+freePDF link annotation
    • 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 10500 bytes
SHA-256: 403a2d1a0b7dea6deac30b839f02022706beda45ee7dec3204d3336f848c945e
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 17128 bytes
SHA-256: 5461ab2e683ce0354989481bef8ab991f7b4812d53cde07e2566ff2dcbedcd2a

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