Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d9f33b49558518…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 10:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42054c3a5a86a0fc496aaf5ce23b1ab7 SHA-1: dfdfc2b1c8c3e7a87f4376d801c7b8f33e7b6c43 SHA-256: c1d9f33b49558518009c79c46d3ed18130d261888874dcf23746fa9f687eedf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself is also flagged for containing external URIs and a link farm, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vagtteam.com/userfiles/Files/97650659000.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f254c9e91d---21993102203.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021072813560973499.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/37878890601.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5485161201---wapuxebobumofuje.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611933013f7b8---37190307011.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fee664uhhcmkemhnge0th55el0/3783748265.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d9ae0ccc---20234681484.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/fopovakokizino.pdfIn PDF document text
    • https://123natura.com/stockages/files/43566627008.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/jopuzetik.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/volun.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/1535418166.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/tuvipiduwazatova.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a71100168---53907440574.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0287c21249ded59148d8d0e46f4ed223/pukulegaduvegowusasakit.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bl7s6682l68kqpgjfh9b3dgqs3/70304688829.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611983bf59c7c---xabofuvutebalifafemo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a499f50db86---fenuvefinosew.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/bogorazezasegemafezix.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bf273e26d448adc0ca5512be815de01c/45035900285.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/12713105465.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a262ee82058---bowaxijafazikivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=a+mentalidade+enxuta+nas+empresas+lean+thinking+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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 17108 bytes
SHA-256: 4430773225838afa89a4ea481ce2be3017cec1e5f41cbfee04295dd30f26456e
font_02_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 11100 bytes
SHA-256: 72b1dfdbe61cd8c55ddf1e81e4379d21e576e126de2f5c2ded2c635b16e4f07c

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