Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91cce87d3a7a5ba…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 02:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81f94be9261eb94e430fef9842b7e32b SHA-1: 986ba726175e49226295c2fe987881358638c93b SHA-256: d91cce87d3a7a5baabb90e7424006813400f24866407237544cce4dc01538047
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating an attempt to redirect users to malicious content. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or further payload delivery.

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://inwebjor.ru/uplcv?utm_term=minecraft+1.14+0.51+apk+download+free PDF link annotation
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53281368e---93363894730.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vapitatut.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/todutumevukeziwumuna.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/dcf38766e9c1a70ebf456ff43a3bac9e/zelenonev.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137faffefc29---rimixekaderatesi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f49070dd---47037548410.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/sufakakafulidiwijov.pdfIn PDF document text
    • https://alev.az/userfiles/file/ratutigezelusejojuvunuru.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/91311589058.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210917071218.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/wugevej.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/jagelotozalumado.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/57984919626.pdfIn PDF document text
    • http://vejwun.cz/images/tojukuwagamimoruxag.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zaxevurowabus.pdfIn PDF document text
    • http://dsagco.com/Upload/file/xidika.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/pewak.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/72957539886.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/zelevexereluzatutom.pdfIn PDF document text
    • https://dafelia.com/files/30024021605.pdfIn PDF document text
    • http://ttc-investco.com/img/files/69604531453.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/42142162906.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/xufamilidal.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136046e97aaf---nesijege.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/47793413598.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/xuzesiribuxodadew.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143480fb4ec1---88007594324.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_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 19652 bytes
SHA-256: 29faf9708f38a1daa30805243ad4f3bdc4745c776b91bb9a45e6f329b5255d1f
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 11068 bytes
SHA-256: bfd3b1be6fdd0cd2767286b3e3dd1d1bd008a3414b80d049820050ede161c04f
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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