Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edf83f9258f1f84…

MALICIOUS

PDF

106.6 KB Created: 2021-08-16 05:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8fa3553fc46c7805f333fbc83e12860 SHA-1: f3be4a093691c84fe26949140c06da946ccc9bdd SHA-256: 5edf83f9258f1f84d16145e38f9f7fb7b02002c0d0a4e37a3aea487c6fcc8159
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting domains, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of these links strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/2614298401.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/kipewekejovivasi.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088378a189a6---1894050591.pdf
    • http://szentimresiklos.hu/upload/file/13758846961.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cdb938b0e7b5975b9a7499a707b82aea/56474965051.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c376e3a3c---jajemetomikosanadi.pdf
    • http://sk-uralstroy.ru/uploads/files/kajobives.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9144797b37---jogisoruk.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16248133842426.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/fcbd7a44149085a6239a6d95c5d22a11/51770112129.pdf
    • http://gleneaglehoa.org/images/file/5365405257.pdf
    • http://aucoindeshalles.fr/menu/file/gonaxamuxe.pdf
    • http://hrzservices.com/uploadfiles/file/tijudozetexedaxise.pdf
    • http://thangmayedex.com/webroot/img/files/wanotuduzejurobin.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf514baf9---xiridugibedagekefikezem.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f2690b2e7fac97b961f9859562bc995f/jorutimenepugufekaxunuwar.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1610dee1466993---54534210926.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/973656214.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/17906735418.pdf
    • http://classicalgardenfountains.com/uplds/file/tojunaxixidodemotumun.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb539c02---27118714191.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c9423532089---45589376162.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cual+es+la+diferencia+entre+el+socialismo+utopico+y+cientifico
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013698.bin
8efa085e4100096c060523ea7d265f343a8a13c677b0326a69d506af8e18e8cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 11024 bytes
font_01_sfnt_off00015039.bin
9a6f3ac46af35a75e8a01bcd5dd40689914884c85d48a9f30f183f8c200fd618
pdf-font-stream PDF embedded font (sfnt) at offset 0x15039 19472 bytes
font_02_sfnt_off00018146.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18146 16792 bytes