Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a34bb5f5de62c8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb36b01c7d45fa83736bc213d7d06b49 SHA-1: 027a454b8c434f9a6f7dfa16e0339687bfb1499b SHA-256: 59a34bb5f5de62c83535aff0ae52c3d20ebcf03f0ef3a19ddb4f31619be6c67f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or further exploitation.

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://roxburyhs1987.com/clients/63080/File/wefida.pdf In PDF document text
    • http://kehlux.lu/userfiles/files/78924926383.pdfIn PDF document text
    • http://exosushi.com/uploads/files/genomofateguk.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/70475129824.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/venotezujexibukix.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1bee9072---retolenanitopili.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3677e81a---33114520577.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/49065300684.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210618164342.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/80739522109.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kimumajopinunuzabusi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1468c80bc---75991448985.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/47454214194.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085339937c0f---zebuliparajelav.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/70010815328.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/purewedejedibubu.pdfIn PDF document text
    • https://soechi.com/userfiles/file/bukila.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a258b0089c---sexetat.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/lunerejijanesujipuki.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/lojubususulamukimom.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/tivinudurasoxikiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=miomatosis+uterina+tratamiento+pdf+2018PDF 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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 11208 bytes
SHA-256: 629923701ca959b9b66b40e4862c6bee8b82dea5b8b59bc833fea6f813d9a4f1
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 17652 bytes
SHA-256: 609584b6851ed6e0a4e28e79a319343fc9a8f270023ef9839208c474266c20e3
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1