Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd26e312a312e5…

MALICIOUS

PDF

90.3 KB Created: 2021-08-18 23:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db7d46938f636c79dfce740bbd875e43 SHA-1: e739b8b1e48b396b97b4b844c0eb03d2fc7af55f SHA-256: aefd26e312a312e5d2dc72fb83534f0b7ea52bf2b35dc7d854d19a1ef0906e47
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it is part of a link farm strategy. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=how+to+put+indy+anc+in+pairing+mode PDF link annotation
    • http://szjwwj.com/userfiles/file///66312345654.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f7f6d863---xaxupidavimomepefurufo.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/balixuweboxoguve.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/31166298386.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36a4a5741---rovesofurilufugoturuzem.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06006460f3---38284312698.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r99k3hprcfefe40ftj3mt4kbf0/14712865089.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609202eda16d9---25225303069.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/tekug.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/j3ap7gk6uipsgvcu9e20ao6fcl/85820395251.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608396cd6f485---sererugozeluxa.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/xunipo.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/figixororuzawaweb.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7abc4cc0c---6433265811.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/wixefanekenanudobin.pdfIn PDF document text
    • http://ccl-ciecie.pl/userfiles/file/manake.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dffqef70ef793svsdd3fon8fnt/83718651742.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/v149i0t3k10g7g6u4591jug2t1/93815761186.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c031675f---fubiratumozasupevi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/065331791c0ba4ab4d92f0c4b2de1a86/bifidepok.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877968dc4---40222495459.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/dupovew.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/paturuj.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c956fd9549---jawawikodofofinak.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510072739.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31783354339.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_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 17992 bytes
SHA-256: dadf7fc1cd2401e0b046762fe846bda94cff0a7dab49460f0c0d35e1d5acff41
font_02_sfnt_off0001402a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402A 10936 bytes
SHA-256: bc99983f49cdf8b85c0938afe66a19989e3f279170ad863849da964261584a68

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