Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e36c68c5f329c40…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 11:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b835f3c2b8983d034b2fdfcc22322f0 SHA-1: 30fd6d20dfa7ad1183f8f89d93eb6592abd70d99 SHA-256: 7e36c68c5f329c40f54d1112ee6c68846bc3e5d322659c460f6cc26dcfd3aa71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=tom+and+jerry+movies+free PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613944bf72e0e---xolulovunijiledewuju.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/rukubag.pdfIn PDF document text
    • http://vning.net/filespath/files/20210906204930.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/bejanogavuk.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/44139836585.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/61216273677.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/zesunijirixuduruwadavebo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d57c8a945bdadccf2e8c9c3a489833a1/debelixeluzegegobulizaz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52fb47ed7f2a8d2f46fab4975040edd4/66758120756.pdfIn PDF document text
    • http://gabortech.com/admin/file/40162867152.pdfIn PDF document text
    • http://195exim.com/datas/files/nomefoluv.pdfIn PDF document text
    • https://triosms.com/userfiles/file/gutepapininofepokux.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/94881321669.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c3713bed---zimuletijebi.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/jotarizavileb.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/98434933061.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/welibededifofikiwipuba.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/99739108402.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/gililetudazazisiguxolo.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/gedomubiki.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144414d1dc8d---94417829771.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/66120596445.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/69093233051.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/busegajisibiwuvararo.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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 18740 bytes
SHA-256: f69db8e9d24a36a2ab10e8d511508d11cc6f2c0cfb3dd7b9713b8df5f8a37dd3
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 10644 bytes
SHA-256: ed1b4a14d60404e880b5c19917a096fb69a8762458f22df8d31fa11936f82c1d
font_02_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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