Malicious PDF — malware analysis report

Static analysis result for SHA-256 28297bb9b4883b02…

MALICIOUS

PDF

78.4 KB Created: 2021-09-24 09:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73f2b352b54003bf662ba79811a889ef SHA-1: b0bf22f5f1dce06fb11c2b65fef0a8a3232b36a9 SHA-256: 28297bb9b4883b0210c8bcc471dadf8cc3d6145313eae4a7dc165b79a0b1b1ea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://atiksigorta.com/files/firin.pdf In PDF document text
    • http://ourgans.org/userfiles/files/32918814546.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/35966896616.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5cd03699---rijutu.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/19235464598.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/55554029472.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/nixob.pdfIn PDF document text
    • http://52963566.com/upload/file/202109180958305328.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/12217642506.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/58560076942.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bc8adf1a887d9be24264aa4481a760b1/99251256795.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d7220fcde---baloxejuxavagum.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed178638a5---veloj.pdfIn PDF document text
    • http://nemochem.cn/upload/files/77298760584.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/57208515996.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36401225891.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/xudakofomenegojawofexov.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/koxifujesemevorijogosip.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/96238585258.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/90219167582.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/764795967.pdfIn PDF document text
    • https://claudiodituri.it/uploads/70561681400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=days+of+our+lives+episodes+free+onlinePDF 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_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 10672 bytes
SHA-256: 730bff278cecdaa1e969a51a7261bdabdeef7f966e4f91ca15c8a745229dd358
font_01_sfnt_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 17556 bytes
SHA-256: f57325c3b7a7f84be20483d1ac8baac805996d831d08bedc97ab18cd563854eb
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1