Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed82e0d51af504ef…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 10:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 87799fbd85083c86b76c8db7e8d5dd25 SHA-1: 347bbeb11e32ee12a2772e13c44189bb1e1847d9 SHA-256: ed82e0d51af504ef8b8a934d5a906985094b26a67ce8942a8b2c5ebf4a17268b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many pointing to disposable hosting or compromised CMS upload directories. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://weldingplaza.com/files/file/sozogurakawikul.pdf In PDF document text
    • http://videocycling.info/files/file/fejimipajinefoziz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edbf58f20a---29102191309.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/16658535278.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/2232539813.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd7401894---19235091217.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/72066927868.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5c4ebaa1---59211104202.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/75327947490.pdfIn PDF document text
    • http://aminotp.com/upload/files/90648827054.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210909_ADBE917A96EAB354.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/sufipov.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139da8b64d01---fowipa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdf909f859---13636833662.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/bufidawopikalib.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/38670557466.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/81282865454.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///xufabifulif.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/vopotituropumota.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/88819033704.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/75074428541.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901152646.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/71752733079.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a18811f5d1---93388434533.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/75968355008.pdfIn PDF document text
    • http://chieucoingason.vn/files/sefakumekivofef.pdfIn PDF document text
    • http://halaljones.com/uploads/files/rixobunuxevodalosizix.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/40173305658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mi+libro+encantado+pdfPDF 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_off0000bb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB13 10580 bytes
SHA-256: 306900464a30eac1af2538e458772090ff7ebe0fb21df5b19d9c999de12a28a7
font_01_sfnt_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 18060 bytes
SHA-256: 27fe0f19baa4ac8e68af4afbdffddc36bd6f928b86ef64f889ace2d29e3d9aa3
font_02_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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