Malicious PDF — malware analysis report

Static analysis result for SHA-256 c500f1f72e0ec6e4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 22:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb33c301a4cedbf119abe4acfde042bb SHA-1: 8b97dc2089839c05f032ddbad62f1e89bf0b4320 SHA-256: c500f1f72e0ec6e441a717dbd0c05b0298b91f224915924a9178c4340a56215f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the overall nature of the document as a potentially malicious attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=where%27s+my+perry+full+version+apk PDF link annotation
    • http://turbotechnik24.de/userfiles/file/duludunitofebufelexu.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21090612132740709555ye8t.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/25174427712.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/12235601873.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109041326561372.pdfIn PDF document text
    • http://guowangcable.com/d/files/tifisurowepo.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/juwilo.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/76570618863.pdfIn PDF document text
    • https://robertbah.si/files/file/56848696813.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/97559304143.pdfIn PDF document text
    • https://webaruhaz.codefon.hu/js/ckfinder/userfiles/files/66065767847.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/76313045688.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/llb6ge8melpm0dgc0mgpa9g354/84974900302.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416bfc0569c---58410703799.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/42340644940.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/91135a36dd774e265359fff472ad256f/zojaxovevuxozejus.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/nisesotagelugir.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/38193119269.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/50633358238.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/bosizofegeresubizeso.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/17455533305.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/73315841878.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/76566268757.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/diwajepowusanagegixab.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_off0000c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 20108 bytes
SHA-256: ed96231b24ca324b662f7497d33fa68d7193db2678b444f5f8ad123ef4ca1302
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 10924 bytes
SHA-256: 35397a37a94bc4f607cbe36ed8de4b600ad058112311fdff7e8cde89368bfcb0
font_02_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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