Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26eee167dfe5ad6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 15:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6741b0d2dec3abbff6bc874c0bb8815c SHA-1: 62504b29be3b1ec271e12b03eb60fd9a74f9e492 SHA-256: a26eee167dfe5ad6ae67cc65855ab259383ef014069d1ae83ac08366542caadc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978204d1ede---62541232203.pdf In PDF document text
    • http://guitarenko.fr/img/files/11498044626.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115e0425251d---pojijupegalezubuti.pdfIn PDF document text
    • https://taperagi.com/contents//files/94696557135.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b4f70bd79d67d01265381493b9e9d58f/55232697244.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/zamaguvoxadovugakipawupu.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/71574114412.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/40241831070.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/1945580164.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/21868844180.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716c2996041---wagilime.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0721a3afa---27350432399.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/pizeg.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/22857294002.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/5142753391.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/40524294748.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/o2ogdid4pkrlgh42ub65i1kbcn/vubibofakodulomit.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62dad96331---xiwonur.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xidiropedavumelepu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/6681314439.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d11f4b589f34f62d66d8736e70168841/nurobodoxutep.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/fiwotebuvegelar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+open+itr+2+xml+file+in+excelPDF 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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10608 bytes
SHA-256: a551e3136adb6ee301046b8e2d31227d41a1f670fdf3d219258a311e7e74842b
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 18760 bytes
SHA-256: be302f74e2bb72a6e43ec9426113bad186e2454fffa1622ab57c2c2ceaa7be18
font_02_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1