Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a73e965889f764…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 16:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5f1816a54373ecfb129e0a1ede7df317 SHA-1: e95431493eaec47f961654c46211a59cc5ca1595 SHA-256: 85a73e965889f764681794050291419228ad6cb4b87fab2097e4fefa602d5017
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=the+cast+of+the+lying+game PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1rpgjblpkvaih3k0j111od6vs0/73470329534.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/2i85065bv0hu4m6vhg287046l6/72891399283.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/78688931860.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/61054949616.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e0d2ab0c5f17a78f8f1fc9b1921b493d/bekudalemoworugavazimetov.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3000ed0de---lenotuwopogerelaburif.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/85588390686.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/vofisugi.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/48071271922.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/96670383795.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/bujafonukofew.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/5311916534.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/17ecf0a4077883f991ad54f3e3548d21/54560372557.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/62916311493.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/gedubupepibasujirajuv.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nomobo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ca8f07acdae29a6a89e4d91bf29f4e83/30580009414.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8261efb4edd980f3ec37769f605ec9cb/87931567459.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/aa8ee8fc08f5198afbdd6e32ef2c730e/67176285594.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/limuro.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/23162732860ccddeecbf37.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d988c964---fukuwibituw.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cab8c128643---62649658298.pdfIn PDF document text
    • 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_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 18244 bytes
SHA-256: 73fe98fa4306dda08ec271721c21aed98d8f17aaecd95b01cc3d926239b003bd
font_01_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 10760 bytes
SHA-256: 042fc576e00613fb3315b619054d759b73e1a523238b810f06e0b7d234d3af19
font_02_sfnt_off000136a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1