Malicious PDF — malware analysis report

Static analysis result for SHA-256 0763d5b9c2530a06…

MALICIOUS

PDF

59.6 KB Created: 2021-09-26 02:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8dcb66f751f5c1f6e4161c46b5fda002 SHA-1: 1310730ca5125a6fcff5e85f99c4057c6923e2d1 SHA-256: 0763d5b9c2530a061b703e05405defe4c4228884ad9d5bed1f552f7fccad9294
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7596

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=asus+phone+apk PDF link annotation
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131132876254---jenapebew.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/sutarojipa.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/siwazi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/joxarum.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/ninarufok.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/zonovufojonifaju.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xuxuv.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/kifotofipenapal.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149713f7bfda---4048026153.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/93392873195.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/pobewijenivuketekitum.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b341dc0522---90366951377.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/66278933841.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/98516083189.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/zasasu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8b1a2830ccd443a076ad530c8f958d7/2845486770.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8a5alnfeg9m9o30nq655q97ht3/51270457325.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/xedon.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/sujupovonefijixedomes.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vejojew.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/74595513754.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/jirejesowodege.pdfIn PDF document text
    • https://trexanh.net/upload/files/22153652130.pdfIn PDF document text
    • https://ikima.fr/uploads/file/94846778222.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/kibitezogowapeferugoxus.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 10188 bytes
SHA-256: de8974c3b74ff5bf12240d7cacc667fc683899fb6f792622e19435ec0cef4a47
font_01_sfnt_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 16608 bytes
SHA-256: 5ae5bf1dd8e701fac59c4be3c48f5759bf5f77ec724f0b4ff0e806fff9cf2805