Malicious PDF — malware analysis report

Static analysis result for SHA-256 c442b48ce129f4e8…

MALICIOUS

PDF

74.9 KB Created: 2021-08-05 16:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31d60512fd5eb66737a1451f3782047f SHA-1: 829eb7ba7482907be9b10e5b51f3616b227a7718 SHA-256: c442b48ce129f4e8fb75c2f89c47f183c47991894cb14299c75fcf095e777056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous embedded URLs pointing to external sites, many of which appear to be part of link farms or hosted on compromised CMS platforms. The presence of these links suggests the PDF's primary purpose is to redirect users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://inwebjor.ru/uplcv?utm_term=theory+of+relativity+script+pdf PDF link annotation
    • http://stolizstekla.ru/userfiles/file/14894108897.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/85b7697734e8f30e6a6f617cc95c0ebf/11850477121.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/5888704691.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/fofurobutefonolapiwal.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/zixeruzered.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/madokiniva.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/novuruniga.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/bivivudexe.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac173511067---67961656535.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/98a4bd67396a6f04b6bb271bb90a349f/vaverivitumuzunun.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/subulufesazoxud.pdfIn PDF document text
    • https://amblamy.ee/upload/file/23258816836.pdfIn PDF document text
    • https://serka.com/serka/upload/files/naledi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hkotirfho7jjdraa6064i05aq4/96299059458.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/78281278005.pdfIn PDF document text
    • http://grabnerestriche.at/9202329705.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/88766560659.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eeb4d587f---budipuwimadubimopote.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76b06822f---gakimuxemigovudij.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/90941886999.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/68476001647.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/53412140163.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd726d5d765---gunozika.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/zubime.pdfIn 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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 17824 bytes
SHA-256: eddc3bc7cfe1179294d9d8ff4e331b6d14ab4c1ae6d62b901a41e5cce372cc21
font_01_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 10756 bytes
SHA-256: 3c2c48bb1c54126f1e7c3a25b75a46760fc1b491753d63cdcf6a8b851c86b942
font_02_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1