Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3d0d6d89ee5b15…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 20:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 561069bb710a1e2d7658c54321620e3d SHA-1: 88f9a81aa4e2cd264916cd4e603c0fd1391ba8ef SHA-256: ad3d0d6d89ee5b157a7e8e8db9e1a9d196d8563150760aa1f87b8772ce0c7cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or attempts to trick the user. The presence of multiple link farm heuristics suggests the document's primary purpose is to redirect users through a series of URLs, many hosted on compromised WordPress sites, potentially leading to a malware download or phishing page. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2425d224e5---tulatutanuposujigis.pdf In PDF document text
    • https://newsru.md/upload/userfiles/files/xowaguxereju.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/69bbcc9cf594e1848c36226dddf4a41b/piteb.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/73922302868.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/lovemo.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/28303346642.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b787b489c8c---fotigepafaronejaxa.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/11319879482.pdfIn PDF document text
    • http://canoeing.by/pics/files/20237220010.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/berefimero.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/luveboxuruv.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/73917701845.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/39006467542.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7a8b53b5856fd266bdd539c930454727/napodizifeledabijuxofo.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/semurukobekijonufego.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/kozifujok.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/92964562024.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/32142888453.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/94660708372.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/bexuvur.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/756b2909d2ef5b4fb2678c53bf069315/mufoxip.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/idi5o1qgaccgrnkq4srrhgput2/romigujavabupuda.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1dfe5459---21302735091.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/mavob.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/daradiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=shadowrun+6th+edition+quick+start+pdfPDF 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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 11336 bytes
SHA-256: 663b45eab86d77d46379a79207fbe91138070661727b10683a69163a787f0ffe
font_02_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 17516 bytes
SHA-256: 6148acb4231ca4bef300d1216fbbef210821eaf38949e76e99006df5727a7895

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