Malicious PDF — malware analysis report

Static analysis result for SHA-256 02530cd5b709b3ef…

MALICIOUS

PDF

86.8 KB Created: 2021-08-10 06:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c95fd57205de0d1078790107a4b62cb1 SHA-1: 2c818ef1e5c38754f0ce75a4d4802d3576980ff0 SHA-256: 02530cd5b709b3ef2f9d03bb59dbfbc9c15267b78b00a6568acd4dc0357c4779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/6936ceb3403b4d0202ef892982fe4b22/96837218004.pdf In PDF document text
    • http://chinahongji.com/d/files/ginij.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/xibolu.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/zopunul.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6697bdfd---77595397293.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/volewijeno.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f22fb538db62b1c1b469be85640e4e92/xosezajegogipuva.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec6c2895e---30230788786.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/betapuvuditowukov.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/55354319571.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/xafusajababenowajixagaki.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/benijod.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/vesewojata.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/5a4a4c151381bb6ec9f5fb9eb47ddb49/temavekixofasorukodu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aea61f81d---66174203345.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d736b302---66611256433.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e335a285---dekizelabepazenanozutom.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224076803213.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c6c74c84ae01cf1b09b19c575e3dbd69/jalavepaxavigewosulen.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/sajazi.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/zejapubolugabegufomerawov.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa15eb1b65---41116289216.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fjcruk989t285e6squ37jgcoom/6273731371.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/xulodupobodusafusodebasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=p%C3%A1gina+para+conseguir+diamantes+gratisPDF 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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 11092 bytes
SHA-256: e23a4c110657bf57c364b30fef6901e6b8dd86ccacb637e3ba8611dc59d7462c
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 18200 bytes
SHA-256: eb73fc14ee6d2f30652e0836d818b5648900ef1ffc30135e60674ae734c2c798
font_02_sfnt_off00013312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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