Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc6f8dda325b260…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 02:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d01937b18cb82e1a5fea0c85d95ae053 SHA-1: 23c048991aee32b75f5d96570fc1ef647249972e SHA-256: 3bc6f8dda325b260e39012fa87d4a8b5d17a17215381b560f40d62dd7aaa03cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. These links form a link farm, suggesting the primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=lpga+2019+schedule+pdf PDF link annotation
    • https://fonixkoncert.hu/upload/file/namowulumeb.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160851434a0020---59106025093.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2015635425fe6719ff0a8d66e3974b86/lojitadimiroxujoli.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79266565130.pdfIn PDF document text
    • https://penal-garazh.ru/files/69154970677.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/dorabutamubisawi.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/kowufip.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/liwogalokowojosajuvaxaru.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/20bb34f33ffe29a06ee7cfcf99f7fa2f/57897212186.pdfIn PDF document text
    • http://www.siposferenc.hu/html/12084131493.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/oqgujlt8k5savpfimo6oc05uv4/fuwetimewumomemisonax.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210618042606.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/10602401649.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/c2sg6bmn970la4qg6talf4s9e3/tenugulewidovunar.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/tebanejawisivoxufates.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58310504b9---lobipusepejikozovajixasag.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/xobelir.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/fulezegazarelej.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/98431231313.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c0c488738---25604256316.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f90639231---vogosomugejoxedivedefis.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/jokisa.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/54991035842.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/43cd89ab6e2b18a3edc2f160b7021f24/52874804755.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ef8ed8722---94887860434.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/36965984248.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/fiwedaje.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_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 18564 bytes
SHA-256: c7240290f4620b5248e6bdd03e5993321e6c1f35e01bd4dca3088c0bcbf5d89e
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 10904 bytes
SHA-256: bdf35921def89900b32610a10c41a6c11feb75f7dd327bebf1e275d1cb131a05

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