Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad9a39053f1b19…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 14:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acae6e6ac9dd2415b7b704a43ebab6db SHA-1: c3000e2bca492c95a39070cddb50f69693b29c76 SHA-256: 4aad9a39053f1b19a96fd604031156c9f983858bcc21d59131dd9fdc29524db2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. While no scripts were explicitly extracted, the PDF structure and URI heuristics point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=spring+kwgt+apk PDF link annotation
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/22442798686.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/repipuzesubo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0c0e21ed---gubewujekuzoso.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebc9c5c35---35358201850.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/3563679503.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/27228045121.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/22700288410.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/81146503f72a046c9decf60112153b01/tawowiselagigexunobapesuz.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/30965580681.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/18807107416.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/gojujafelu.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/86504079770.pdfIn PDF document text
    • http://airfa.it/userfiles/file/81990441367.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/74347914643.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109070427362747.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/22805322885.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/54664558656.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/14432442788.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/14616058670.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/42551953734.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xujewome.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/puxenitinuvawaraxutusat.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210914_120643.pdfPDF 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_off0000c1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10216 bytes
SHA-256: 68de1cb154ae75fec8f7f8bc05aac722e5d8b49a2e767d48596107b59c1a78d0
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 17456 bytes
SHA-256: e2de01232b428d74fc7346fae04a73a70caf3b87ef96a1feeb49aeed2972009d

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