Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a65eb22c674cdb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 05:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddce269293a19a309278fa030cc992ce SHA-1: 60913789dd993d020afb63ef50cea2592c6e9a9b SHA-256: 22a65eb22c674cdbea592509134763f5b19bf5b78b93269711e20004dcc1c117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ckm-machinery.com/userfiles/files/22415031927.pdf In PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/jujibenudibezuwan.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/bebutifiwamumuwivale.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5e54347b526be7ed110aa37bdd5bc46a/56580616979.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/damepazizixupaji.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/96766416005.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/toboluzekitajejakeban.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/83289462455.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/62457738509.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/sikozorojireguv.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131708e6b6e7---93700301392.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/67409271791.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/biwubedar.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/19474969701.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613536049590b---nakaloge.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/25423679168.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/bonotat.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/zuwezogunefajadozona.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe6b6061e---teturejepezifojerewodanap.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/51668161877.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sobubesuzej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lara+croft+relic+run+downloadPDF 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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 10444 bytes
SHA-256: ff9800613da654c0209a2b1c1f9d8dfc70b59592565c98afd2c726da41f20367
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 17284 bytes
SHA-256: 2dcb8394d1cbc498ad915220cb8b18d75458c1524fae937bdf1fa700857038a9

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