Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90543a4826984c9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 18:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 211eb55ae48a51d2e4bf225782831c65 SHA-1: 762988b1c80ee81740290a6fe7cc0b02e83137a8 SHA-256: e90543a4826984c90366344d4c13f1f3b36e2c8a9675962959ad900ed8c76b57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains. Heuristics indicate these links are on disposable hosting and potentially compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=base+de+datos+relacional+pdf PDF link annotation
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/7262890371.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14094022483.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/82382342144.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/totideme.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/varaxozugujavi.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/49442948225.pdfIn PDF document text
    • https://izr.fr/files/68103948952.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/winigotutufovedijesa.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/zozokavubagiluvim.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fuputokaru.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4ua3nmq60930il0a75qd97fif7/97299651160.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/4669596814.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613807363046c---gebuxavafesosufuvep.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/jijozatokoja.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161330bd148a25---37995176595.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vamumogumidun.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d6dec20c---tekexokonepidemarifuravof.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kulabujix.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/kafisujexuxoziwawa.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/15309202623.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/juzoz.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/gemeripozev.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b3ad4f21dfb75be415415973c5aabd5b/basomudadixumozetawokon.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/83048623960.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xejazodabureserubiv.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_off0000c2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 10668 bytes
SHA-256: 5b6174c0b93c4dda1da9e0f462132b6c73461e94a1056ef6ceb02224ad834a3e
font_02_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 18040 bytes
SHA-256: a09da7637cb18e6b70defc02166511d46b4ff1c7b988d0db110ffdbbaa34d8d8

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