Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a1265ca655bc81…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 20:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93f40500dabb1d42f4bde99bac435052 SHA-1: 801c57f8afdff1427c5c78e2591a96b224ac1cd4 SHA-256: 64a1265ca655bc810f3743572fa72efb3f128ea290cfe59fa5c7b62b5b02044c
124 Risk Score

Malware Insights

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

The PDF contains numerous links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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 http://xsteelstock.com/d/files/63452714647.pdf In PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/18348924723.pdfIn PDF document text
    • http://foodchemsino.com/d/files/tiguzorabu.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/vobisutovuxufixomom.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/62244373848.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/girazevofifekix.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/fazopun.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/resonaguwulabax.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0c8f8406d---78185324055.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c13f8e6b1b8---xufokuxufumutedori.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607715d39b793---97135611255.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/99416819391.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zegodolafiw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee0585133---kekaze.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/37972183627.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/tejofotugafexunonajo.pdfIn PDF document text
    • https://tigapilar.com/upload/files/gewevemamutosapedesekapa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d99292ab1889e3c84cf6e70c490a488e/3934857717.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/35374552101.pdfIn PDF document text
    • https://areicon.com/images/file/roboruwonil.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628209736.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/32358776073.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/68997411041.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/gafikogo.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/safibokupolagafezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sintomas+de+asma+en+ni%C3%B1os+pdfPDF link annotation
    • 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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 18216 bytes
SHA-256: 1dd48b3decdf065c9f1e90e5b5ac53a651e702e05ae32b038159be35aaaf238b
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10792 bytes
SHA-256: f1c92ec6abc67b12224366bb99966af9d284f45290af86a67513b3b792d548f4