Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc79c92e776b7e48…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 01:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7138484b868e66261d162ae4ba6eaa4 SHA-1: 25fd9f427f0ffef89614665c2e6f8ad298b54bd8 SHA-256: dc79c92e776b7e486353b97923cecc589e94eb5247cd7eb0ddec5fcc0c301b50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=ringtone+apps+for+android PDF link annotation
    • http://vaynhe.com/upload/files/fawewasazef.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/23677151222.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/39450534260.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/1622349027.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf65705080---pukijuvibadubitujibazube.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mudopapelami.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/99132152443.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/52072408665.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/34039772364.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/61350541480.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/49438537876.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/ragedobopitur.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-1/20210901115349281718.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0178f4e56a4f5c25514cc22101d819d6/barebeg.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/pelatijololagamuwam.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/58255133871.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/99557321967.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/fexileta.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/20729473724.pdfIn PDF document text
    • http://secretinvitation.net/images/files/bevesujevenagugodobotivi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3b7e466bb40527626932815f764a1ce9/wojituga.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/norokidesadixinasozovi.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/35961706079.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b988a926---91841266623.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/bavuvivetusitewaxisulu.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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 10672 bytes
SHA-256: fdc2ff6927563544e5095baebd2c8039e1f9139a9cea74f769c89640f85fa9c5
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 17180 bytes
SHA-256: e938f3a76bb4baa33043ca3d2fce7ad25646b511b7347cf8b55967e7ad66a763
font_02_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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