Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a25edd673157482…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 06:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 634a51c5f8c96311c1305834bba57da9 SHA-1: 1217841bf95005431586d6df02d46985642b336d SHA-256: 7a25edd6731574824057504456d004e3401e181928ab2bbe00e221d337357af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The file's structure and the nature of the URLs suggest it is designed to lure users into clicking on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=single+dating+engaged+married+pdf+free PDF link annotation
    • http://officinedesign.it/userfiles/files/jirunowira.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3e66bd15---nulinuvenu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4dbhcgcjvhqtprckrvvvv5kc01/zipebeza.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/12190775649.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/soxiwojapu.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/18845606287.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/6902312026.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/76877985394.pdfIn PDF document text
    • http://carszana.com/image/upload/File/mebawasor.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3492499d---56400182965.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/dimodinaninunabirabamo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c5e0dce777e013829fa5d664de336e7c/21251524096.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fekazim.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/dofupivovijosokulino.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c1443aef---89895044554.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c260ab1315---fejoxovokebufu.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/rutipikozopipalipaforol.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/rajazuj.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/vakexivoros.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jjvi1h24m0gn89scdg5fr4rhls/37627428169.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wepapezazufagomo.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/gigoj.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0796531880810de361569867c1f16ffc/17290919997.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_off0000c731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 10628 bytes
SHA-256: 0b0439ee4e45d62fce577d5e705d604a63afcd18d2aeea02b47f652f6bc6d8e7
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 17268 bytes
SHA-256: a87fd8ed76bafef3c906f804c73615678ce9c1822b210cc977f4383563b094e3

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