Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d791fbcc044f890…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 03:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23a57072aba5c275427c4b65ab80d257 SHA-1: 11290c7337e2ec55e846e4c17ca39c34d1b09636 SHA-256: 2d791fbcc044f890d7f55a33ec7dad67389c3f3bf9937b9774133b0aaed4e84b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://inwebjor.ru/uplcv?utm_term=best+website+for+3ds+roms PDF link annotation
    • https://k31szmq42-nu28.com/contents/files/nowetinepaxin.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/kikuf.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/67967191570.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8c905bf00df6b7124bafb96b904a4e64/13536478444.pdfIn PDF document text
    • https://korankertas.com/contents/files/66777282673.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/25722887143.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/90381162004.pdfIn PDF document text
    • https://bor-diing.com/upload/files/15205284291.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161380d520b992---pipefudulesewosexafe.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905112652619542.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909054915.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/mewojejinafiretixixip.pdfIn PDF document text
    • http://venkateshservices.com/uploads/papiguvepumoz.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210913154833.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/zisewizo.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/dexedapebopexuk.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/ronimobabebuterizedu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/zeboronopowapewesusuk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d8d40d2e---sosupudosoliwumixulusebof.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/zawimu.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/fikelediwobumegukugixu.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/ledejafapuje.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/wavutigizumudovegulumoz.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/69190532173.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/70975265617.pdfIn PDF document text
    • https://taperagi.com/contents/files/gokamuxob.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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 10652 bytes
SHA-256: a880936d97be7545eee15f3d6fb0925f595df2e1df71eb30b046a5bfa22ae9cc
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 17536 bytes
SHA-256: 4b3f7f5a2ca22fe6660a66d25a88f76917fb9e441ba6f5b1818fd58f3634736c

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