Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ac246271a77d46…

MALICIOUS

PDF

76.7 KB Created: 2021-08-28 20:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f6c3ee7da329248607c8cb8527f680e SHA-1: c975e73845b2eb56d2f1d9d2dd679fe63a9e33f7 SHA-256: 96ac246271a77d461aa6a200bd500bdf559ffaf1c9cd01577c6f082400c5c4dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=what+is+the+average+typed+words+per+minute PDF link annotation
    • https://capecoralliving.com/media/file/91543741219.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/relunukuzevajawel.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210822084336.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3607d60c84---10632152604.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d99078aa46ef05165907727682a97e4b/rirupeb.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/zudedoxepuzadubelokalat.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/petalojefodokusomumo.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/97976462704.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/28743559255.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/tupabokudisabu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a768d7263---25676698157.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/89039830176.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/wepugidopefezowirekelijox.pdfIn PDF document text
    • http://delve-cr.com/uploads/lezubuzo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2d206168---38131806918.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/47612177193.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/rozadirefavurudedupu.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/23666130475.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/zubapad.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8240caa9---ledowatazosig.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/75e7eb8c888ddeb8836298f69db6b39a/89819594516.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/sebuf.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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 17124 bytes
SHA-256: c668a16d95349b544a0696e2a21a6f075d439f42d5dfdab8458e0ba853754d90
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 11152 bytes
SHA-256: 8225d5ba7d76a9cc6cf97ea1a68e4b932d25fa14b158fde0926a9fa70f00e959
font_02_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1