Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2a4108606b3249…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 14:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0be4667f4acbb349d0e28fec25b1cb2d SHA-1: ae5f19a806fe879ac5d61614a86a55eda3add640 SHA-256: db2a4108606b32493c63e7262a5f323037c7a8738809a69d2a90b9cc4ea331b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to artificially inflate search engine rankings or distribute links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gyn-ordi.at/myPix/file/62957762584.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/48faf1e2c89143f3d17ce4c0e089da14/86392709394.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/vanunofofi.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wugisetuvarajelomexe.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/10213457646.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141beacf2cd3---79571221559.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138e18042848---xegevurozifebap.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/kubodifenonetebuj.pdfIn PDF document text
    • http://ativn.com/upload/file/zesizido.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/60090908278.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/68423346182.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/salanelamagu.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/nigefosab.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/juxaxojifasopaguv.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/renewofadimoxulelosetuza.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/jomawejatude.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/98415184206.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/79179239495.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/9801681041.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/74b4d0cddf627fa1d65a4c755560cb3f/12748377299.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/kuwonofezelusi.pdfIn PDF document text
    • http://saktigroup.in/uploads/60543506280.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/3904786750.pdfIn PDF document text
    • http://lex.tj/img/file/84696601019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mario+run+hack+iosPDF 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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 10236 bytes
SHA-256: 05379b672ba07e9aacb8d045b716eef85aee33531f80ddecf18c203a1d7b9e72
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 18824 bytes
SHA-256: b43427ed66ef06a53ad369e81eeea3e5d39b258ef3463bf4f240f0c279adb2c2
font_02_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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