Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef26442a7c2559f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 07:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64012f1bc5064d7ec306f74d80dbce4f SHA-1: d80e0be00f87b383b63c9f0177e17583cf3e8dbc SHA-256: 3ef26442a7c2559f57f24ff3f69b2ef47943d0b05b27eb620762a8b9f3f53ed5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns align with common tactics for distributing malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=taptap+download+android PDF link annotation
    • http://corporatiegids.nl/uploads/files/2615315927.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210910190621.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/xagesazetusasunovipira.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/15994305948.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43fb9654---46266994790.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2tkgp07tad0ne2fil4olpffmd3/37760797988.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/2055465255.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/44206833368.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/36691486425.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/rinutafijogonuxupol.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f119ee32c1---tikesorekawotololasiji.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/tunikodefusamirujesabodis.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901171802.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090109480870554.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/detivalunafoloruz.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/5157505759.pdfIn PDF document text
    • https://chineseclothingonline.com/File/21585415927.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/82759768838.pdfIn PDF document text
    • https://kultmotor.hu/images/files/54514518946.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/78821760427.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/51397256804.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7a580c89647a52a43fae1073ba4c5db5/masofenokujamumiviwo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/72965366385.pdfIn PDF document text
    • http://citty.org/images/uploads/file/73973384947.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/pojesuxiteruf.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_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 18956 bytes
SHA-256: 80b4ef839bdf3273ca159d80a0d6a15c75159f66075a7591c987c5f0318f84dc
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 10132 bytes
SHA-256: 84fbc169f2c60d8061e73302ffe81b880ad463d25803c5b5d9e20fd1ac8cea54