Malicious PDF — malware analysis report

Static analysis result for SHA-256 37edf9000b32806f…

MALICIOUS

PDF

92.6 KB Created: 2021-08-27 17:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5dc0992fbe74fb82edc886ec84905c75 SHA-1: 5a8a9f739659030dc51bc304a0791c5b2ebec545 SHA-256: 37edf9000b32806f666d7707062e7a9eeba837c313535d2a52ba6e087409dca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting an attempt to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and link farm indicate a likely intent to redirect users to a malicious payload or phishing site, consistent with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://beveragesgs.com/userfiles/file/74077197487.pdf In PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/970779695.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/76351292302.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9ff39cbb0e941481f41d86c27aef392c/mepiledenisenowi.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/lokuwud.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/jabetav.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/50674730232.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2a8b3eb60e46bf21d405a9ee8e4ca439/wijoxu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a2b84bf23766799ec667620b827ce680/35353102016.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7vku0uu4h1dhte78pgvp48joc0/zabawuvaw.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/zidileberozi.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/kefoxidoturejelife.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bususo.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/63511725868.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854dfb8c511---buwuvojo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/95ae7ca3d1594ad22d87544ead3411f9/83540699452.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/27605893736.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/87958711288.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/62585398645.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db5448a1ab932e16888ed6a21ac93389/kufisutixobudenuzitoto.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30948aa2fb06c57e1482882bc5af8ddb/49117127981.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/77877375626.pdfIn PDF document text
    • http://asvpp.fr/pdf/mupaminatetomixewefonijo.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/85390943253.pdfIn PDF document text
    • http://chinalabware.ru/d/files/3301689563.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210707094753.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f437b6d6191---33447562489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=midpoint+between+two+numbersPDF 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_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10664 bytes
SHA-256: 4e59b8c36d6ab9dfaa78c509ba781b776751e67cf2186a9af38210b590114eea
font_01_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 19048 bytes
SHA-256: bf599dad08f2144312afb9f2be149169b2dc14f11d699aed445fd6ae907f9248