Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9962ca824dccba0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-28 08:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 496c425143bdc8b6cd1c4a7e2d4edc7c SHA-1: 868987215b242f896109cdb60a801fb311cac744 SHA-256: a9962ca824dccba02ac2d3d2a4ce9ca1aed803dfe321b9c0fd04516292f79f8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=when+is+my+hero+academia+season+5+episode+15+coming+out PDF link annotation
    • http://oldmotorsclub.com/files/file/kawidorimulajema.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/xuvovupekojurinoxenixis.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/b7k2ho1i0729f9v384bec2s811/47048776345.pdfIn PDF document text
    • http://handgun.ee/media/file/51814972740.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492ed6c40ba---zojozefe.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/gatimuxubatuzejo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136502c24ca6---45826702006.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/kosexumake.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/wezugokuxuxati.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/xogajinaxuganowisevu.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/ziruzavim.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/94756754688.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b42d9fb1d---55050133651.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/buxigubabijasesugomagage.pdfIn PDF document text
    • http://seto.cz/uploads/palafomakikewaza.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/7217016221.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sujigojemekefito.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109051100192916.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/53306617664.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eff63036ab48f455ef6fdf1e9ef8506b/xugobipufi.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/rolanulef.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/46825313154.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/29785110719.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/jojemidimukubedipo.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/gawogagalisopujamaleji.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210906095150.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_off0000b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71D 11308 bytes
SHA-256: 136878e43959a7022262f0d2bc4c28b1c7e0e8d823de1ac0d2ab290622310d5c
font_01_sfnt_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 17684 bytes
SHA-256: 0913cfe48d67caf070dfd85260dfeadf383edec5f16473f16901877d00ce673a
font_02_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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