Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8523a86c5f9e00c…

MALICIOUS

PDF

75.2 KB Created: 2021-08-27 22:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 336e6fcdffd6015a19e1615830946a52 SHA-1: 5ff14534632bbfec9a8ecd7e2f12d48ed4f018bf SHA-256: f8523a86c5f9e00ca2a2ec2319d7752f137c71c21c0807710a3c6a1e7f290adc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with high confidence. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://csn-alliance.com/data/files/34582501310.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/651744870614cc404f79eaa8bec381cb/kapefodigopeseguf.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/38947023149.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tadofera.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/nomafugorigogubufexixa.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/zijadod.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7ar1jtk95jp8hppvamj2j6aa8/25094322219.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/zewufijogimofikala.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bevapupobabineguji.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7dec437f---xadekize.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051721502163.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/wapedi.pdfIn PDF document text
    • http://sam-global.ch/files/file/morulegorejarulaxikaf.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c219597ba0---meremow.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1e1a49188c453b2a09fedeea91eab124/59653031207.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611880360fe70---dabilisuto.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/sogofazom.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/mofugorakonufize.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273dc2cb089---pijuvinezaxinanal.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad615ba03---20348229141.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/gaxom.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b7b77eb12af9f0488d27e3228348a9b9/tevozale.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/57126416018.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1204349d---rodudovefexajugobosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=another+word+for+forbidPDF 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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 16444 bytes
SHA-256: ebbd0919967caad87603a6c4864e553a222aeabff68ec66689f0d31f1dd332ee
font_01_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10284 bytes
SHA-256: d2da1ed0106612a499abc67c422a4ef1a4f361f2300b0ff2188787d040e2dd36
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1