Malicious PDF — malware analysis report

Static analysis result for SHA-256 294e752e81420682…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 08:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c990d223ef87d7bb84d87b646cfab0e5 SHA-1: a21a98f678c0a08ea66fc075eebac1a0e9548302 SHA-256: 294e752e814206828a98a226d75ea9cd1eec79f0e9cf2a71d70f199cc4c2d22b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the embedded URLs are the primary indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8d5d51b85---jefesomalupefixafobojato.pdf In PDF document text
    • http://edumedcare.pl/upload/files/43720466543.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/26060873523.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23486425a---javaguvesikazeduzubeme.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/927433104.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/97291924749.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/48353028748.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/perujukamajafa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3e078bc0---71342547366.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3dc71d79---kidijixudowaxime.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/merezudajesoduwesalejoj.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/gulovagapizevuvagu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1e9gdfdj49qll3omsiposes0ha/85580418445.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/542559d8d8e7a812ddb963016effe718/topagamitow.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f1f8e26e---10324606282.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/xobadaferufekufopoje.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632900bd70---82328727579.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1aa9f16d4d9d3856353abbbfa84911c2/gogebenonadubenis.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/17155997652.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/delizefujanesomexuwar.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6f91e17f---gufufusowojodepoweponin.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd845c69ebb---rojamep.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/luziva.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e94d60aa---vinerevekin.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210820181840533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=brothers+conflict+light+novel+pdfPDF 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_off0000bfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC8 10856 bytes
SHA-256: 400451eebdb9da6db959ecf9112582c14ed16dd00222251dfd19df72e3abd2b0
font_01_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 17020 bytes
SHA-256: a97116c679c1c784ee882e3cd62ba5cf148e44baecbae0b502e5537f4975cb84