Malicious PDF — malware analysis report

Static analysis result for SHA-256 2966c609ad9962c1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 21:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 419e2869e6495ecd73dda2dc0779e931 SHA-1: 0fce4cf28ae90cbcbc6157f7cf1799d08792747a SHA-256: 2966c609ad9962c11a9330043bbbee9457b0976588bd246e14e38fc2c78ed16a
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on compromised or disposable domains, one of which is explicitly a remote-support tool lure. The embedded URLs likely serve as a distribution mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://coretry.ru/uplcv?utm_term=ps3+remote+with+android PDF link annotation
    • http://smelawservice.com/file_media/file_image/file/63102176752.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/duvedosavolejegojebiwox.pdfIn PDF document text
    • http://talleresjpg.es/img/file/gefomizegu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/malokal.pdfIn PDF document text
    • http://att-na.com/upload/zijipubivakifigog.pdfIn PDF document text
    • http://ustunongel.com/image/files/71895252056.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/dozuver.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/79f0a357e7ba851fbda4c781ec56b41f/62219672857.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/lekolapapeb.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/86048971110.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/xunawaf.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/duxepure.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/giwizubaselazokogewuxobaw.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/52326843667.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161415ae7025f5---vaneregukuxiped.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/ninezasizusewukovari.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/tosuk.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/86477075701.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/sukijumov.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jezowezidezo.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/43482972423.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c47765f4c---difolakivopitolidudi.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_off0000c64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64A 10728 bytes
SHA-256: ef938d517dae5183b2a7d8a6405c5ebbca8e17922150c220fe4ad3398bead3cd
font_01_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 17640 bytes
SHA-256: b194573978f2d58a27fed73ecb54eae1c05763393142479667b45b7042662663
font_02_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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