Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c526c68d177eb5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 17:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79d2207c1561cd3c76797ce478707d43 SHA-1: 6a7e24aef66bbab2dd0eb3183ffb5a6e96cdf1a2 SHA-256: 27c526c68d177eb56ef991dabb1ab889d6092dedd98ce7460e36337c5f6f50ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the presence of numerous links to potentially compromised CMS upload directories and the overall structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://jts-electrical.co.uk/ckfinder/userfiles/files/24975813519.pdf
    • https://whiteplacard.com/UserFiles/file/dulovafizinut.pdf
    • http://momsystem.ru/public/file/34749751346.pdf
    • https://edouardweil.com/userfiles/file/zededaxuluzafudujop.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/64021082262.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad8e885ae---67474624196.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ut0f1aj7fhkvvdh48pc7msibk1/peramujamafulusovu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6152df77d---vivisotoj.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2427ea250ab04f3d0d124682b08c6167/69619532256.pdf
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/vonenozuzapenefuba.pdf
    • http://taiwangallant.com/uploads/files/202109022153173246.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/75164c701d41ccc20487c555531cb4f5/37160866289.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/66133953747.pdf
    • https://myclubowners.travelenvogue.com/userfiles/files/98807352230.pdf
    • http://worldnaturalfood.com/image/upload/File/27973772283.pdf
    • https://foodexgida.com/uploads/files/liganenowevanos.pdf
    • http://hanabi-la.com/uploads/files/xanofopuwonamuzadamilugo.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/39863843995.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/sozudupisojujokabol.pdf
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58959857451.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/49763130518.pdf
    • http://hyundaiokla.com/uploads/files/34067049263.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=batla+house+full+movie+watch+online
    • 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_off0000dbc4.bin
7cd72b1feae0ca1097ffd0e7f9688f03acdbe470e2e1f8246f61e9490a48d90d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 10808 bytes
font_01_sfnt_off0000f4a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 16792 bytes
font_02_sfnt_off00010cb4.bin
fe3b5a8092e8ab3f3a837ef040d3540655b24e7a99487488511044781f7b0fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 17852 bytes