Malicious PDF — malware analysis report

Static analysis result for SHA-256 91247a8b7363472f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 20:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80e25acca2a6192febf609ee95b9e3fc SHA-1: 2888a0ebe4d10cd86e6279dcf533eabfb18ea856 SHA-256: 91247a8b7363472f1a04cc6414cb52f4d3470052ad7445bc1f4aa280091ef909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=one+hour+one+life+apk PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb741a735---45594187315.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/zipamumig.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/didolibura.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/25473945729.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/fifarafipan.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/nugaje.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/13de8aa708fe6f37855f43b5753e0d48/21357005535.pdfIn PDF document text
    • http://edituj.cz/res/file/wasetodiwuta.pdfIn PDF document text
    • http://hadt.vn/upload/files/vufiroja.pdfIn PDF document text
    • http://denge.aero/upload/files/94648342202.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/redunevijubokuvazetefiliw.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/87579588288.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/78024518960.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/514b92ab37e32fc39399443428b2b00e/87019154578.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/dajini.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/56942908975.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/29273583032.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/dereninat.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/fugowijuva.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/68620431316.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/5014622452.pdfIn PDF document text
    • 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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 16568 bytes
SHA-256: c0b54953126e98b7b69a0442d7bba91bd223a8f45c59f30d479e8e1cd989c017
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 10404 bytes
SHA-256: 28832e3ebd7b398e62667244cef7ae9dde7906bd28f9d732ab91a28ee3c79b55
font_02_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1