Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b7256194a557eb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-14 09:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7851c5c8b94c74fa7be77ff4cda62e9d SHA-1: ff65489eb161d01f418cd0b4df7e0e50091ae304 SHA-256: 07b7256194a557eb866818cd25f58e0f9c8ee4b48b6f6beeeb1d125af659e89e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://i-dron.cz/data/file/24519164632.pdf In PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/vategab.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22357266673.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/80169566867.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613432622dfe6---20054100283.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131059c2b4d8---53002399856.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/ripowubefurezewuwopurojix.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/45036325055.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilulalevofa.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/85613862065.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/96652591097.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e1c31d76009556503e8d8a932a1c09b6/80341168196.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/kefubusozijezifebokiteza.pdfIn PDF document text
    • https://paradigma.bg/uf/file/43511811326.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/rewuxatelekarare.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109020513047386.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/15379715708.pdfIn PDF document text
    • http://aprt1day.ru/file/xumiwuresezonases.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/tiwuxaxumodadixu.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/delekamaza.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/3910246884.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/76224316061.pdfIn PDF document text
    • https://rjpexport.com/files/94577394007.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/48021084179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fnf+fancy+pantsPDF 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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 16136 bytes
SHA-256: 60bce2b42b2537befb999d1c8a5b8de454a54d13f5ae31650506546d8a11cd94
font_01_sfnt_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 10072 bytes
SHA-256: 543b36e4a990d68bfee05a7a5d0c7aab161d8047a39c21149977da1226657625
font_02_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1