Malicious PDF — malware analysis report

Static analysis result for SHA-256 03dd951ebb6364c8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 08:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65c65aa17cb28c335c507674a57b8bb6 SHA-1: 3d2205eed27011321b72b5e4a7159db0b19a197b SHA-256: 03dd951ebb6364c8efebffbd7f3234162131f89e6c666d464b4831c582ff6230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=bin+sachivalay+clerk+exam+syllabus+2019+pdf PDF link annotation
    • http://grupposcorcia.it/userfiles/files/falukot.pdfIn PDF document text
    • http://fructusartis.com/i/File/78352982589.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1d84297b2---dorudazijaridewuvom.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f6a539abb69d5caccf671d795761b88/lupiwaxarobapedu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c964acba---97017031787.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/guliwuvafon.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/8sacumd154tc1o2g9srkfrn6n5/42299652619.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5baa175249a442dd7a760a13bad972c1/juxedemewu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/kivubusiju.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/zojepas.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119143c59070---14821325047.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/17968368849.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/remebirajelo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5dfaf85c---dixoki.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/gotuputezadesiretogi.pdfIn PDF document text
    • http://hydrem.ru/images/file/zekawewotox.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3351052c2a318e42dcfac30ecee046a1/zinaxujewu.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dhf73v9vqdiahipcvr130ucf3/poxigilizujutazaze.pdfIn PDF document text
    • http://mariancozma.com/_user/file/57823123962.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/82312073386.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd4c0c40f---kuduzisanebozejutadoxar.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/majuzudusugokupurufuk.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/dexabekixuxakowi.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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 18200 bytes
SHA-256: 9d5d4e8b59227cf27982c74a12d9be47f49f74e7e47f3a80ebd5026ce303b3ed
font_01_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 11796 bytes
SHA-256: 6c988d9a0b5f937bf395d6b895ed024a40b15c8e72619000daa408b4b811db72

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