Malicious PDF — malware analysis report

Static analysis result for SHA-256 459329b8826d8a28…

MALICIOUS

PDF

80.5 KB Created: 2021-07-26 16:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3fb6e0b3ff391f47fd82906fadb8ff95 SHA-1: 6ecf94766a660376bdac71f653152c9beab18676 SHA-256: 459329b8826d8a2801e61420345826dd80fb9e3d9d1a73db29dfe0531cdbfe27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to lead users to malicious content. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://datatech-int.com/userfiles/file/37125488581.pdf In PDF document text
    • https://pasarantogel.com/contents//files/15254289560.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/raledozalinamekavujunilo.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/86094579360.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/pokaxigesujedados.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/borumep.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/saluneboburowawobupi.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/17569614429.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/powigefaxevijexulakip.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608154e0b74c0---40073873807.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/852e4b8dd1072e78d4e5046279cc0406/fubirolupibugegojebumu.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eed9424c8---11528157774.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/vonafud.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/pigavogawirom.pdfIn PDF document text
    • https://artbynela.com/uploads/file/tixoxutukivapamutu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a7b802ca8a31911c60c214dd81058136/kibozaxidip.pdfIn PDF document text
    • http://superazs.ru/images/news/file/pimuxutemu.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/sulajuvejam.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721ac2e6c6f---34565993996.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/10431447405.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6262bcd918f89fb4415de6230459d670/23824382706.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/jozezenozitidagimegebur.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3ea930db---36210652892.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792519ef9da---rodanap.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d613871c4a0---wuxikutemopawinaxer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=insya+allah+sah+2+full+movie+bioskop+2019PDF link annotation
    • 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16036 bytes
SHA-256: dc63ffd555cdcb2c1a6cb48003f2f9ad0191830300938bb50c876871c8adaad6
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 11348 bytes
SHA-256: 4fb73b6ef7c15f39009fe0baac553090a168128fa2bd72c93df2a65f2d19bb66
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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