Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59fc558cf2b4173…

MALICIOUS

PDF

90.7 KB Created: 2021-07-30 14:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ea0729af7de36c68faf7b6e0a3678fd SHA-1: 9f60229ba0ea96958cc4462470998a8b1ceb2dca SHA-256: c59fc558cf2b41733242566e8a6b57568f1fb9dd23241b18a675c5a8c3bb1d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of embedded URLs suggests an attempt to redirect the user to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085796a310cc---75574118387.pdf In PDF document text
    • http://arunimaflavours.com/userfiles/file/53679270118.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/90266777776.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/deveteguzotajuputoremide.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078139961cfe---67523238552.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160738e029345d---gipejorefunuz.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/julifogititarakatafifu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab9421c42---1445005508.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160788ccaae16f---77840638513.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/ruxuloruxokogat.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/48799234963.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a10c54caf---14235208251.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/67bc232ff40b93e524e7adabffe4d18d/16488981025.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/85001371379.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae3bcd7925---12191951233.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/xosomuwifanibuxarunixor.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/luwogeviwilotigurap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9be968a20---7475348939.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jewepi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3399f8b0fa---luwozewileda.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///73388834543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gamma+phi+chapter+of+kappa+alpha+psiPDF 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_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 17220 bytes
SHA-256: d9a37496f3ceef0e1cab26bbdbcda034eaeee028d704a5eb075e2a753a1ffa10
font_01_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 10772 bytes
SHA-256: e2c646a0dcb0f10cf30eb16054f84a29a15cd8154dfb95d908768d1ee49f1842
font_02_sfnt_off000143f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.