Malicious PDF — malware analysis report

Static analysis result for SHA-256 b292e1eb0c7b0d7f…

MALICIOUS

PDF

85.9 KB Created: 2021-07-26 03:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c45f6a524c28d9a09a8bf4a2a0a9e1d2 SHA-1: 913942a7e821a5e08fc083ab21054aa4e6383254 SHA-256: b292e1eb0c7b0d7fcbc856a447e5f9f467c9798796ae3d9f8c05ae07058eb52a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a18b6f8e---19403673555.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e6445ec3---xugededukovazukewulekol.pdfIn PDF document text
    • http://taociren.com/upload/file/2107231658384903767azk36ni35y1.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/84695369920.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/nogapaj.pdfIn PDF document text
    • https://artenika.pl/fck/file/zuled.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tunima.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/33323664492.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/60820718122.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5da545e4d---85774622278.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/divupezufowu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r98kr1p68vp9oitll5misk5dv7/97849582946.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/duzotakimosut.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/velafoji.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4e77f6b6---bunexizesodaxejujiw.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/soziregurebozez.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0441d4c04---56184951520.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f676b55850---14721000489.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7477940ef41ff16f6363866d13b8d5b9/76941718467.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/marazorog.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474506c856---67955453116.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fb3467128f79680c282fb08d5ba453fe/24937088447.pdfIn PDF document text
    • https://andrejc.si/files/file/44074449245.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/43388071552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=san+bernardino+county+sheriff+inmate+searchPDF 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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 16884 bytes
SHA-256: 93b1c5ad0cf850cadd77abd0e1123a9b31acfe9ce1421e95b3cf73a948db416e
font_01_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5E 11124 bytes
SHA-256: 3b1fad658dfa3670446524b2514575d87ddb820d610ed982f895515cc26f4321

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