Malicious PDF — malware analysis report

Static analysis result for SHA-256 f216f48736012d10…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 02:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3267057dedee1b4f1e4a170c26c2db15 SHA-1: 8c666d8f961a91a4b04120167a701b146971a4dd SHA-256: f216f48736012d10e69c8474a17353cfd6a7f05befbb558623516119b297014c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI indicators and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c0b157c2f---7248047449.pdf In PDF document text
    • http://1night2daytour.com/ckupload/files/50308614491.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d76e33003f6---loxovumokux.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/46067663b8fc2b6d8629996e85479cc5/wumewepotutikiref.pdfIn PDF document text
    • https://ysh.my/userfiles/file/93319734172.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa47723bf---febux.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fasezaponanomuzajele.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/newivowoxuxalupek.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/63872550887.pdfIn PDF document text
    • http://santeh.md/img/files/575931294.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611a61ab09f10---gegaruxuwopimun.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210826_C26BEF25AFD4ED7D.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/depur.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef17fe3ab90fe4b0fd818c033d42e59c/kexofodapifixupi.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/69564414947.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/fuwuwipoxe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4b7936cf2657953a79cc56c05262829e/makuvedu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/67162365726.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7bd7fda8c9ceb03e0cb1c2fe56f760db/subexubororetaguri.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/8267769664.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/wibewazofekupodafaj.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/97830159894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=npv+and+irr+calculatorPDF 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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 17916 bytes
SHA-256: f60ad897a0ddd2441b994c4a2cb73b5697847793049b71c678d8efc4af9e6687
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 10348 bytes
SHA-256: 5ca8253dad2ab63d8342940c976507063a482f16a9eb5d05259ab9a365151fb9

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