Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c26ea7ef785166…

MALICIOUS

PDF

102.3 KB Created: 2021-08-19 16:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4ddf279cfbe79a491971dfd15e22058f SHA-1: 5be1a5ce596ef6507db9791c7f5ca589748a9c70 SHA-256: c4c26ea7ef7851665ca9e484f1c7aa64c06d72017fdf929f4bebf662f3ed1b6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://mistral-paints.cz/userfiles/files/88027239243.pdf In PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/18593377920.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/vulojibusozutuzoro.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160766d010960e---mokavilitatasu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/daredoziv.pdfIn PDF document text
    • https://renault-service.com/userfiles/fituke.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/1fi5hhvkvh3c5cs9gl2ts5iq16/18398997079.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/34662552609.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc75887d6---55056735936.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/pijurisibemorit.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9c258acd6ee05c60fe648f273b5c8d4d/92304029391.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160947d71ad44d---komitaxovapabezeloku.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/69365514103.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/rubepituw.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087731d42f82---sixegubotebiguxiwuzep.pdfIn PDF document text
    • http://gazetavk.ru/img/file/7478872772.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70546858997.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/xatixamupenub.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/51488658760.pdfIn PDF document text
    • http://weingut-suppan.at/files/25736945210.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/5c969d9117835737a4a52f27cf82aa3d/dubabuxuv.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tkdpq5ieg60vkf22g1gu468gsd/21185119873.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/netivujusiwizeruwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+set+up+a+dirt+late+modelPDF 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_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 10628 bytes
SHA-256: d97987e4f695cd931c68ff87258099f904d9be6ab54088c92c1d0e7dfc3b88b4
font_01_sfnt_off000140db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158ED 18828 bytes
SHA-256: d6c344a9a32a754d23661d671dac426651668b36b81d4ce5e7a89dea8171dfc2

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