Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bedbe1ebdeec1b…

MALICIOUS

PDF

136.6 KB Created: 2021-09-07 18:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f85c2f60287d48e997e474ca5a39d65b SHA-1: 89b8f05868c66ba17c9353814d411879df20b1e3 SHA-256: 37bedbe1ebdeec1bcabf6c25cc89682552be9b6dc5aafa446aeb356121175474
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://contabil-fiscal.ro/mm/file/15306450348.pdf In PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/96950386999.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/002549e554402145e18dd2448b552a96/92032896324.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/berupevilatojabek.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/43824445412.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/gefulatekavapa.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/76548187344.pdfIn PDF document text
    • https://susta.vn/userfiles/file/rabogapilajuvijodegilofol.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16116666c64f41---57562747499.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1b0f799f22be78b7f3cabf41e5ff1e44/43432423111.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/lamobuvavux.pdfIn PDF document text
    • http://sbcnepal.com/images/file/86362760204.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/katatunubavovotikele.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-04/images/files/gigipugozi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7b4cf72e---8797918750.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1dd7169d---553012637.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/wapav.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a897361c79f---zalir.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/34831742987.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0bf070b8c809375b04d13b7f05a84e1f/polorifewenilipomozeje.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/fasufobigudomodofiguj.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/fd27efb1877cf95954661657cfc3088d/pavuv.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/116ae052379acda3fb07440cbef04545/96165681629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=modern+elementary+particle+physics+krane+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_off0001ab8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB8D 11084 bytes
SHA-256: c4774a09435b0b614457de15bdd988e314b52189ac26c4533e6e0eef54d0137b
font_01_sfnt_off0001c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C52C 21088 bytes
SHA-256: d0940b2126c19f3944377da931833d07fd0d560b40964a32946d07d700ce13b2
font_02_sfnt_off0001fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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