Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec34f898eae71998…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 23:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9406c449cf048cff1e7bba0466a83f2 SHA-1: 8a2bef3942c6701cd3b48e71a5c85d2cca830ded SHA-256: ec34f898eae719989ebc29e5f9f45c963c4b7963ada7c6fb78ac5852f5909ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609870862fb70---befubasemiwunapawi.pdf In PDF document text
    • http://tareeapartment.com/user_img/files/17195215579.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/77546831537.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/59cb938fb40c2c31f9e7483b6a6f2fa2.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/burajunod.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/muponazovaxate.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ceef0172---86739063058.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/puronugofowiw.pdfIn PDF document text
    • https://termocasasrl.com/file/kenukobupojipeve.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/78848879839.pdfIn PDF document text
    • http://leguido.net/files/wofilixasizajitoguxidovo.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/76833141783.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vixep.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bef3396bace3b42e050f644a4ab2b3f0/kabulesofopafifim.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7f0034f4111ade2962dcbf28d2cecc66/josajupukexuxarilabuv.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/5576683793.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/dimoxavijigupamuxovup.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32414811954.pdfIn PDF document text
    • https://maviet.vn/upload/files/87861922900.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/xelosazenovevepubad.pdfIn PDF document text
    • http://normel.org/files/upload/file/jegesujidu.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/61630340086.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/2061817771.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2898d9875b---61338871009.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210703125846.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36188329460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=accounting+for+decision+making+and+control+9th+edition+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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 18856 bytes
SHA-256: ba344efed06a25de362d4d5665eddfa543ad2fc126a3852b9ad0b64e9cb7bb42
font_01_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 11408 bytes
SHA-256: 9ca9ec4fe3c2df9687e589adf7a74f82f35a6753d376edbc0a5e4c9fa9cb8034
font_02_sfnt_off00012a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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