Malicious PDF — malware analysis report

Static analysis result for SHA-256 215bd731f21c72a2…

MALICIOUS

PDF

91.6 KB Created: 2021-09-14 15:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d1d1e1bb7ac7db7fcfd28a81134c9b4 SHA-1: aea7f45372b11b6e0d19d844eaf31b95bf5397d8 SHA-256: 215bd731f21c72a2d31c62b1ebca5f63e31c5de577b6d707e37a66b951ddd59f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics points to a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://chcial.ru/uplcv?utm_term=android+phone+screen+glitching PDF link annotation
    • http://anabakorea.jp/userfiles/file/19500773974.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/xurexajiretefima.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210913_974FDF0DCDAAF895.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/jubuvelutusaforag.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fujurinuxofipezaroxut.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/rukuki.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/foxeduwamez.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/389986646.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofuderul.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/zafeku.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mufafugilobojapipozav.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/39668340546.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/zijoxuzorenila.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/86102558258.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf98ac61c---27766071495.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/loxofuda.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/28758409720.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3cd6ee7a---93230595576.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/filogivilofitina.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f05b1fd83---13359919485.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/39203751027.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/57729739045.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/80958192560.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kapagatofulidefon.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 10612 bytes
SHA-256: 16c4554acd94a6a142816e66de71bb5c505fe91f4a6bab1c7572615e542e474e
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 17656 bytes
SHA-256: 13d30b1cfa8c146985cd2a8b4ea4be396455baefccbdea8f1ba6a3edcc06c2cc
font_03_sfnt_off0001490a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490A 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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