Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c33c10a2674ba6a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 07:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89d4bcdd3ddee610643f2d87c3017556 SHA-1: 1b824578ea2a9e9f061b71d8d53f34666012a9f6 SHA-256: 9c33c10a2674ba6ae889f0d358b16cd8a4da5f9f1ecae29af27de35f173feada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=ride+ninja+apk PDF link annotation
    • https://baruipur.org/ckfinder/userfiles/files/zubosatujisubunepijisipo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161395fcd6bad8---migobubimiperasu.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/novir.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/79114416650.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/segonobutitepifus.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/79533092844.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/dafiparefawuwi.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911202500.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/tupikaveda.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/64809709056.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad28e5a4e---balaxape.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/69162473476.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/xugugixik.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc3f5a58d---fenewoliv.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wemiwusokezojibexego.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210919_041441.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/tomebiwul.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9ucjn4bli3h786vcbf1dr9pqd7/74291121804.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xomasovama.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4f2f4574cc5ad6ce16f858a0aee63b0f/gakokomonas.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/53487698054.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/sozisuz.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/zugodefamun.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/83610993531.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/3986061046.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_off0000bedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 10120 bytes
SHA-256: 81298db8f8feb0389b6ba3b4463648d9ca3c373500587fbf26487f4478b009a8
font_02_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 15928 bytes
SHA-256: 28abb4c9bbb6778fe95e820c5674d6d5ce74f8a0c0781019556f2a4f83b92592

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