Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fcf70e2e822c92…

MALICIOUS

PDF

117.8 KB Created: 2021-07-03 10:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ba3200b48161423f29a15838cbb9ba0 SHA-1: c7a2e72e50cac00ae6ea262f2dfe8695158fae1e SHA-256: d7fcf70e2e822c92c34a395eaaf78ec7fbde653f8e8c9077ec01781d921e9b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://cructi.ru/uplcv?utm_term=i+need+your+love+righteous+brothers PDF link annotation
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/23062018763.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/dolabofafebibolumowazagul.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c521a4cce4---jukazoguwifewadisebeg.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/85674553673.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210530021307960762981.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/hllhr86vr63bjfvtrok8mufer0/15841094336.pdfIn PDF document text
    • https://beaszemin.com/files/84303297247.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/21552141298.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0823b631fd785f93ef120629f3dbb7ae/84410003785.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a191db7a---xigenegidowifezikusaris.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ae4a81ff---xosutiroponado.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dfca4c94e---48445861747.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/xipabenapezizesekaras.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/55405581209.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6593f9f4---nasobelutijubiseji.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24777a43bd---fanazuzalapirudejizezos.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/19555360105.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mng4gh82hm2gf0cmt20jc7rauf/54705734314.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210607_DEA31805DC07BBC1.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ac769208d3d---xoxemafakabamupafaki.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608521bb9f20d---gepajupexog.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/78806628153.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/lawop.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/karajisomexevop.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/gakunubaxibodu.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_off000166b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B8 10736 bytes
SHA-256: 53f0c71238f053f8489060979d96304d614de1335ec38c8af2fff514c0814538
font_01_sfnt_off00017f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F11 18932 bytes
SHA-256: dc5e135983d7154b55b2985f0b40ed6ee7ccf28646f0adbcca623bcad1325127
font_02_sfnt_off0001b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1