Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f79e8fa306096d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 13:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 056426e8e309ba8fbadadc1cb402450b SHA-1: 940d7797cfd87ceee9f3f846e3073743765560e5 SHA-256: 54f79e8fa306096d9c0a8f8405bc2c64cad95aa28fb6c1e52e6531282a144369
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://investmentskillsgroup.com/images/userfiles/file/vudakefur.pdf In PDF document text
    • http://louisamerino.com/userfiles/file/nedewexogunuxuvusitesas.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/73501645712.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/bejunat.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613090cd8002b---31207043929.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/vixoxefesagevom.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/20417586323.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/6114336852.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/surodotamozurop.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/difar.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51149791459.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/bolokovoweboze.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0a4f081a---99044211028.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zezibasuvas.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3sp7l3jgu3vcolvlg308i8m928/93238342586.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/95894562985.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/72097656527.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/7624344474.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/54309259473.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c67b88ab8a---73145635176.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904235847406320.pdfIn PDF document text
    • http://minhanh.com/files/xilukisogemupikira.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161389e93ebd6a---sebovafido.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/fekikamirus.pdfIn PDF document text
    • https://hoalavender.net/upload/files/votabololeboma.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9b0d25ee---sujemasobilawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=avengers+endgame+free+online+full+moviePDF 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_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 18940 bytes
SHA-256: 92a9b453950b2b1f406144f404c89818ea31f0c9ff7622e9912526d1f03c003b
font_01_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 10744 bytes
SHA-256: e82d74d7a01b0d119f85e73bd29ff32bad2d49237690c468f972a43d248fd821
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1