Malicious PDF — malware analysis report

Static analysis result for SHA-256 339c5dac15f067f2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 02:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdd84495f4aefc2f8971597d27be428a SHA-1: cff4c8b6f0ff4ec2e4855196cbed723fff99a8e4 SHA-256: 339c5dac15f067f2a9cd753e0d67b170048b5412caf1250c9ea215b1499cc069
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=how+to+play+gta+5+android+without+verification PDF link annotation
    • http://allgeology.ru/ckfinder/userfiles/files/1669478314.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/bidativ.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/19400508864.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/sedatu.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/54251378712.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3f11111d79322eb53985a0088e0df090/rawobowimivaz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4a9ff312808b12ce15c2f908e0a913c9/42921729677.pdfIn PDF document text
    • http://vejwun.cz/images/bakisifetegutakose.pdfIn PDF document text
    • http://sswjeans.com/files/zuduresobotorevoba.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/daxowomufovopidanabu.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bosivo.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/fakax.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7b93ac1f---37010822290.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/65400687952.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99245bde1---wonipalajolezazubujimogup.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/67814677040.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fudevisosazetiwa.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/dokegelu.pdfIn PDF document text
    • http://llux.vn/uploads/files/zebanagi.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/voritizuno.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/surur.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/69604832980.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/895d49c9e9d6b43519570b8af69efe78/sajevigoginelunu.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/kupedegotugupesewugura.pdfIn PDF document text
    • http://awards.nl/img/cms/file/98293314568.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/6062240809.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 17180 bytes
SHA-256: 23e24040e23b0ea00802bafec43e58218ce7c6d83e57700999b2d0891f8e2e92
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 11224 bytes
SHA-256: 99678779949b4967e7e46ac1cfe8ad743ea2baafe09b93d88c2b83c5ef209080
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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