Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d4199ae5c0d9e1…

MALICIOUS

PDF

94.4 KB Created: 2021-09-12 01:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1df1d2d6b78b069e8a7fea6b5e9af7cb SHA-1: 69f2cf46ff0e09cd9ee85f6c6c2aff093f46413c SHA-256: c6d4199ae5c0d9e19099c38aa8a64801593ee0396809ac91677eff0e99416eb4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ip-golubev.ru/ckfinder/userfiles/files/36527370697.pdf In PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/37094127753.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-1/20210901113402982886.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0d40aad5---15892708845.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/57976421477.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/96010311003.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4726187473.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ddhr0ahn1htol1284hf5u6gcj1/fijuluk.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/2721599947.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/lokozedetogitakabuluro.pdfIn PDF document text
    • https://bauarch.bg/files/7476849348.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61360F21697C8.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/52062414783.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a933c76d5d---vesarigemalofape.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/86418900898.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/18211291993.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/zirefuwovafi.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210911_060359.pdfIn PDF document text
    • http://specialcats.nl/media/files/susemur.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/nopumulotusedunasur.pdfIn PDF document text
    • https://masukpt2.com/contents/files/17587968797.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/bcce2037d5882ccee401cee56006e5da/34592636509.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ketufowojirudodis.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/vadefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pdf+dracula+bram+stokerPDF 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_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 19816 bytes
SHA-256: 85c647de3523459f208dbb2428523a73eec1e018089d00287cd3a6ec9c97ec9c
font_02_sfnt_off000152c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 10772 bytes
SHA-256: 7a3be5a60dc588148eae59062b4ec2ee2bbbc96b3bfd8b6c8f63a31fbd9d7097

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