Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51d3f5c35e25d1b…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 13:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: abc7a00a3ecfaf92ddecc7a1905075db SHA-1: 15cb5cfe5fd9ee895cf8fad1ffece82aea01a6fc SHA-256: d51d3f5c35e25d1bea5112f1fdb4834aaa64a27534fe278dcbc5ed023e28b599
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a link farm pointing to multiple compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing or malware distribution. The document body is unreadable, but the presence of numerous links to potentially malicious content suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160712705b9951---68876431010.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d4a2b56ba35eefcde03f4ee200906c25/90471797038.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d43533574cc---pomolevubasak.pdfIn PDF document text
    • https://shopabrang.com/images/files/43698269551.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/feba346598b777b38ace3cf88be71f98/36913179871.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/winoxidozi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4saj5pdb24q857ckleghr484kg/mixowugezufav.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xizeveberezon.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/55664109478.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/taremeteb.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/bbb53379beedcb91c174b6d21385d77b/88402536129.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/gekurugejokozefojoze.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/399614d8876c1afc842b53e77d646306/80234242666.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85465316976.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/dovimisi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/23163593124.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160702e8ac56ba---famibosesikubekux.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/67627163402.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085386d4bc1d---25886207136.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088bdfa5d039---taxip.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607443b829197---wezeduzoxivexokifobufegis.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47250447393.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/c9p7eae014d4utechclv40p55m/98919235295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=extreme+house+robloxPDF 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_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 18728 bytes
SHA-256: 4b7057fbcdf8553ad1520ad5d1aedce7a43dc983d5a9bf27eee4cb313dfec3b9
font_01_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 10340 bytes
SHA-256: e464c97408fde72a39b573580d4bcf5f669cdce076ddcb186e95abcb63803299
font_02_sfnt_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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