Malicious PDF — malware analysis report

Static analysis result for SHA-256 c304c9fecf6e1847…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 17:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a57bc8998545dc86f496168412a37b96 SHA-1: 3178290e6ed11a10cb90aedfd023721bb1c0450e SHA-256: c304c9fecf6e1847a3cd82070d4fe2be99888eaf65a9b2f086cbbcce9da3aea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=molecular+systematics+hillis+pdf PDF link annotation
    • http://thucphamchucnangmy.vn/uploads/files/18494449871.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e07692f2c---53550806817.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/xakelefusazegagu.pdfIn PDF document text
    • https://bursac.net/userfiles/file/29600844770.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2bdc499---70021414733.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/69866868029.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/73601564805.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/velenamovudagebaxamilizes.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/49446677330.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/nafamul.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kazagaxadejonijurex.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161351e80e1ac7---38918922590.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vodekevuposalakefelutu.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/45291804015.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/gatavuxel.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/78972458644.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/57617483046.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/tujosebitekobotogata.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6d386691---12153610280.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gatiwuxivek.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lifezugigejawaxoliseputap.pdfIn PDF document text
    • http://th-hl.com///upload/files/97268765017.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/gomipamuzitejovabor.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/safedewazuvigozizowarig.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_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 10988 bytes
SHA-256: 36baa95e5c20cf3c219ced541b95f47f0d2958e848ae9efa8bb8a035bc684549
font_02_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 17664 bytes
SHA-256: 218517eecca028904d5f2ba79435b09be6ecf81c0cf5b1b6a8c7b464fc778b67