Malicious PDF — malware analysis report

Static analysis result for SHA-256 888fe42a205636d0…

MALICIOUS

PDF

89.7 KB Created: 2021-09-09 19:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d01ed4e10081690ea861827d8f53923 SHA-1: 2ad44f24203f4211eb5106df03162f3730c479a1 SHA-256: 888fe42a205636d0836ae7dc7ce1be5f352986ffa1231db3cf2af1fd473bae52
196 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to deceive users into clicking malicious links. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or scam campaign. The ML classifier strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://gitteszoneklinik.dk/ckfinder/userfiles/files/15587822155.pdf In PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/vamis.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/rijisuwuvezagireni.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/bolerajale.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b78ff6621eaf0e70b40d164a74b7af89/rasusanunepigukebavuvegin.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/38320222830.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/fejopusulefojunemoxeji.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/07e0b3542296589c1aafb06d307babf1/44403297884.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/wiwutagolidag.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/dixexulamukiretatut.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/16083108054.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/49504708166.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/bofupezejufizugorodokitu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c1ee7a81d3969acc4bddbb1c2e0ad71e/zojuja.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/jedukubifulusogop.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/nikoxirovolifebodo.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/kimekonejoxefugisov.pdfIn PDF document text
    • http://4bx.pl/public/file/vazarizimuwukema.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/najupimolodabinizaki.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8b4cc20b---55555998370.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/t1njpaqoad19b95uik6qtlush2/91925374404.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/5063241211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=friday+night+lights+gomoviesPDF 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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 18760 bytes
SHA-256: bc0556fa5c6e1e7407fd743a41a8aa6177dfee07bbb58b867f5fb44a57948350
font_01_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14041 10852 bytes
SHA-256: 2d84b677c1853e2e217334c2b6c9f0d19c233e44a8bb7d5c377690919ee4bac1

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