Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e61b9f55076b27…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 19:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e5f301c07d66cee40548f19201ff1eb5 SHA-1: 2f54775005600a07875e680be1500589e0bf376d SHA-256: c3e61b9f55076b27b6fbce3f78b6240eecec90028c7e78ef1a4e2690fe698995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised content management systems or disposable hosting. The presence of these links suggests the document is designed to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=dizzy+on+standing PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae9436c39---vuteki.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/86254459262.pdfIn PDF document text
    • https://norservis.info/files/files/fagekuwilinuzenabesek.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/9731187562.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/fusanupozix.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6dda2d4466374b50a32d21cc81ca4325/pejawuwib.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/wukesi.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/wuzugevu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6a17f2183848e6ff9327538e1fd984d1/9147779133.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/92754885666.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/kimiwinowaxidipurezazuwib.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151cf57db357---39686377958.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910235935387.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/80703114346.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/96653540430.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/49ac8c6cda497e0ff938767dd4046419/24007034557.pdfIn PDF document text
    • http://midel.me/userfiles/file/44786678630.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/86802445122.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/73721677660.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/kelogexo.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/64557381798.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/12033128041.pdfIn PDF document text
    • http://rvhifi.cz/files/file/97452999416.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/30836573515.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/fuwufazizedegabaladavu.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/naliregokigibatuk.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_off0000b13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13E 15772 bytes
SHA-256: 92cba8a343a10183949847578de50b25f2c2a11e6d852ef1840fdc921fe976ef
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 10320 bytes
SHA-256: ac5aa4fb0164f0e740bd62dce3184308fab2da3768dd34c8dd8306548b6d7923
font_02_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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