Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c056f83c7dda6f1…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 06:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d35d3ee9f0ed203adcfcdb14cd7ffaf SHA-1: cde671cee1b51882ec57608cb97b723a0ae8f5aa SHA-256: 5c056f83c7dda6f1f2ad5433a081f18b0be791940c5964d318af6896ae388764
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and URL patterns suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=subtraction+for+2nd+graders+worksheets PDF link annotation
    • http://tlumacz-lipno.pl/pdrzewiecki/files/raxukijesen.pdfIn PDF document text
    • https://zhansq.cn/upload/file/bekoj.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qi4e8c3rf2a641fn5lcarlk81c/vofededemopepito.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ad803f094---24413279438.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/zakesara.pdfIn PDF document text
    • http://proxima-design.cz/files/file/mexumedibedonuf.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dqq91osb0volcbe1ihgau6pt5d/33160120122.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e6c2f783e14902ad6c39950807deed85/22521682759.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e433f05f---xarepinomozif.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/17239167171.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/13117306931.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/50846468818.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/fasirudasujo.pdfIn PDF document text
    • https://dineflon.com//files/19476459463.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dukifonukumiraluxunugipak.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da7b5d3cda1---sonadowusepira.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/75253258422.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16128aaf8627ab---52913455755.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofokizovakat.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b75eb8e7e---53223027031.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/gutenezokudot.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095e39819e19---19404592606.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/b0u0m65kr3guc1fjrt5ueln0u2/99703544436.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108070301368682.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/36367528087.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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 16648 bytes
SHA-256: cfe23c6ad75afa6a86d59f8154de0d2329061360ddfecc2b3a614dfcb5f54456
font_01_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 11320 bytes
SHA-256: d354c53236b8dac443c3fdbd21e7203b384a4dfd5de151c2cef9fc16470b6882

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