Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f88323817ce1ce3…

MALICIOUS

PDF

89.7 KB Created: 2021-09-03 14:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7e770ca22945effcf85d5b6270284d9 SHA-1: 376b58f7aea890ad7088c15f0da85ab71b204a3d SHA-256: 9f88323817ce1ce3b4aa62255a47a386ac31b8520ccf06d9d948c95fcd0d07e6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://powermailer.in/userfiles/file/61781049824.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c461abfadc---dutawafevadir.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/063abf03c937822c5a60e408702f3e84/lewefom.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/biliziroz.pdfIn PDF document text
    • http://inistor.com/ufiles/files/labafixinanuxaweneke.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b745d5aa5940510202e37ff5f0fcbfc3/24518978657.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/11721164692.pdfIn PDF document text
    • http://kaies.cn/upfiles/210627200322293770ti58e2.pdfIn PDF document text
    • https://valdisieveshopping.it/file/jomedelefi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e83a96f6c3accbf62b0a612c027427e1/muxuja.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/mugupajaxenozufi.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210815190054.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/buleriratuvegituwixumux.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/bepenejovix.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/33412115440.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/49991811115.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee26c7a0a37---temajoruviv.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/podov.pdfIn PDF document text
    • http://k1a.ru/images/files/file/57060683786.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/47717469871.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/71012305485.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6c653cd8---26436530691.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5f34f40f8f291b3908f5daff69b0e876/12953987202.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/pisejidobosezozekejovedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sentence+improvement+pdf+for+sscPDF link annotation
    • 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_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 20400 bytes
SHA-256: 8bec347f1ba0689cc750a1a282355375c2c04eb0a45a5e115b68fd22e462cb71
font_02_sfnt_off000140dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DD 10716 bytes
SHA-256: 0107465ed14530a1a549ef6af5ba2427bede7ea95852a447ae68f38a5c98a303

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