Malicious PDF — malware analysis report

Static analysis result for SHA-256 206a308f8a33e433…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 22:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fb401dfa691dca3a785cba28153cd580 SHA-1: a7f700d799e6c4882072ff08a98f0045980dec4f SHA-256: 206a308f8a33e4338f000c94fd85aef09b174b1d74c970abb83f0bc290940bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a redirection mechanism. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting malicious content on potentially compromised sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/685c4db696261ecf07f9dad9ff221f72/pusisijamajabije.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f28f53f608---mefojemebubipiwo.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/pizipumop.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/55749266244.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/82101530106.pdfIn PDF document text
    • http://vce34.ru/attachments/file/84960820930.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/piwurowabukutaluv.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kixokonoguludubo.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jovavasujabimevimuzepo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139efc9426a1---52493972482.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/265b9ba07c946df4b40f68c167537488/kuzoturozaxenelu.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/filodisuxupikepe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131f41d8cb11---xulakugan.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/34321937765.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/83103219600.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/24529522822.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/50390073607.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/48723901660.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/widiwinoxinulajekebenus.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/tifivogudusasowanovakak.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/71300547876.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/56748259446.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/91974503830.pdfIn PDF document text
    • http://surtek.biz/image/files/20150408_024958.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/jajuzorivumumoruwebero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+system+ui+appPDF 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_off0000b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 10352 bytes
SHA-256: 914cf16ee98e71c3855bc71e18c360e24231d68324a84b639dfc059b84ce1863
font_01_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 15792 bytes
SHA-256: 60bd90b2fbe8c8a825db62cc1cbed362f8925f4e0fef1cbb368c11113d95ed1a