Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6c22172b932070…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 08:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eefaa61f4a363a8d624c22d7f8a8eac SHA-1: 9087aa10f8339beea6d4e50b6ffef4fd351c9303 SHA-256: 5c6c22172b932070764b2e05fffa4ef5968a7619800ebaa4a1c4d94c3bd3b257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inprovitcentroamerica.com/ckfinder/userfiles/files/98574405462.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/eea07a399055890a4e0873f722f50e63/xefewevagekegife.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/makaredizogopisovuxep.pdf
    • http://bananamusic.tw/uploads/files/202109070516288408.pdf
    • http://npk-bypassdrr2.com/file_media/file_image/file/vajedini.pdf
    • http://kryotherapie.net/neu/userfiles/file/foxitiwotupovavawunefazud.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c95354f330---papelorisi.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0d6273c3947d19289485d0724e99c2e0/5702660022.pdf
    • http://innotack.com/userfiles/file/didadegigulat.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugum.pdf
    • http://es-iyashinomori.net/yamituki-n/uploads/files/gitepevepupefexipo.pdf
    • http://sarkar.ie/userfiles/file/kogudoxorexof.pdf
    • http://saeronbio.com/userData/board/file/ripawuxujezukix.pdf
    • http://www.zywawiara.pl/pliki/63109489181.pdf
    • http://erh-hu.com/userfiles/file/wudenesidamibazuxade.pdf
    • https://wegofa.com/userfiles/file/87164915633.pdf
    • http://castrolmintabolt.hu/images/upload/file/newazijerixinarateridiga.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d6c822ad4ba52b491ddef7fb2cbb51bc/11442581548.pdf
    • https://indicaperu.com/userfiles/file/ketorexikesosuzezujev.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/bazotanosikiv.pdf
    • https://damiel.eu/userfiles/file/radutu.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/63532854747.pdf
    • http://villa-carlshorst.de/sites/default/files/file/baromikajolokezevazi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7fncvf467n571t5h8uqq07fljr/40630680357.pdf
    • http://rutka.pl/media/upload/files/5fa293ad79a9f8ff87dc6da36dd7d3d5.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+will+happen+if+you+reset+your+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb3.bin
6ed6f3ae3c59fadc8593cc3f41e0d544462a9e0313f747044f9ba0af112aa9be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 10748 bytes
font_01_sfnt_off0000f671.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 16792 bytes
font_02_sfnt_off00010e83.bin
916b227a30205e1a9e8cd0c947a3f72e3599e096683a96655eb3de5b3fc24290
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 17940 bytes