Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecdf237997bb37a…

MALICIOUS

PDF

93.5 KB Created: 2021-07-08 12:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10170e6edc307c5d0066cb105ead883f SHA-1: 9654b7f846cb5b67b09c1db4919a4d4e679a3c28 SHA-256: 1ecdf237997bb37a6633c29a92350308edcb390e8b9816e8439e98002f19ee2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=how+to+screenshot+chat+on+snapchat+without+them+knowing PDF link annotation
    • http://creativeindustries.ru/uploads/userfiles/file/fejipilodepixan.pdfIn PDF document text
    • https://arerp.kr/data/file///zetilewokigizisolowagaxu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074124cabbce---lofese.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/61ad2e0a88baf5768a8262ead2e2272c/47640540729.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/38281bed38c105946aecb723b0190ab0/99350569505.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/75694402813.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/deziragapojazofetepen.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/08h3en56sq0bb3lkn1rla7qfp2/daxupukupemoletilo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/papadivuvade.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/97242138380.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609009e295e6d---tatelipenijepezifaxifiz.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24c7abf82---64711986302.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0a5ff38c36ef8722ebb3a1eca194ae67/motajesakeselofi.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/35cc0b650c024a85beda3a2dc92c0160/51363912406.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ce265f821cefb34d6a27125adcc3ccd3/jadoxi.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/46164022483.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/72776651115.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/95c4f6842627ccadd4072da7ace02ad2/6910235119.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/36aff6e76488c255cd59337b3a947b94/11779627908.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/71808211252.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/72115036033.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/jadefupupololulu.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_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 17320 bytes
SHA-256: 2086e594035374850ed90e65edac57fb4309733631fe23abb03141d7be6d2c8e
font_01_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE9 11044 bytes
SHA-256: eab4489f2c52649dc508f363c710cfdc24584bf8337d387d88fa19ec14b191e0

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