Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3eaba16abd4828f…

MALICIOUS

PDF

62.0 KB Created: 2021-09-10 11:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0b706d2458997c22e95b9f750e0f979d SHA-1: 3b93cc703b6b9261f00db9e57842e7b3caddacf7 SHA-256: d3eaba16abd4828f3d4211a76bf77d2dec5727af1bd7e753c0227836b95997b0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, forming a link farm. Heuristics indicate these links are used for SEO manipulation and to host further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5382

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=doctrine+and+covenants+commentary+pdf PDF link annotation
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907054936873075.pdfIn PDF document text
    • https://tckontrola.hr/files/5032637961.pdfIn PDF document text
    • http://wirheiraten.de/images/file/15673102792.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///71304864477.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/64207020783.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/67163832651.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/ponujukuwugu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d033fb2---48862367529.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zixewa.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/fewurozomega.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/62074301994.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2523960c91f517de7c9defc7ca4ba938/maxusazejukudid.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nekezefubofudizawudab.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guwupubidema.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/45610323988.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dabunolunuroxuxepisivipa.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/68886165215.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fbb022bf48745f75c7949974a7db23b7/waradojekat.pdfIn PDF document text
    • http://orthopediedelft.eu/files/23624502249.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/74661138872.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dawijesuris.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/setozazuvijipore.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/58518416592.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/ratoza.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/94896176727.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/92177074678.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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