Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61b5da4acb257af…

MALICIOUS

PDF

71.4 KB Created: 2021-10-07 15:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ffc432141d88ffda4b2ada25ecedf280 SHA-1: 6fe561c79ceb7c4ea3f7d12d662764e21e2d6487 SHA-256: a61b5da4acb257af0c5e50f024acfd50b5bebcdcec2a7de7efd5d51e64cd071b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 6

  • 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.
  • 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
  • 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://abwbaltimore.com/uploads/files/3153564777.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/77893662592.pdfIn PDF document text
    • http://hybsch.it/upload/file/38940338968.pdfIn PDF document text
    • http://elitvorota.ru/f/file/14434445292.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c077e859c0fc58f97df15ddfe027bdce/9978745924.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05484be62---72390666393.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28075644445.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/tabanoxerodofegojopapi.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/zuburubured.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/pejuvig.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/40288431891.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091706005698.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/56702609600.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/wovuja.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/60861148393.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dezigin.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/judonewe.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1615b50ec81337---51628624800.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/58984098962.pdfIn PDF document text
    • https://maturana.cl/upload/file/78041845445.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/63501186444.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/98251970447.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/porawijes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=little+brown+curly+hair+dogPDF link annotation
    • 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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 18700 bytes
SHA-256: 9571255e9ec218d245140a323b657f2f5174ff1ceb9c3dd125dda961efef3bba

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