Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53c51fa19a2b24d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 19:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3870ef8add899db56dce81518f5a7c41 SHA-1: 67c910a211ca1cfbc2c6e00c51d91efcdcdf388a SHA-256: a53c51fa19a2b24dca61954e6f9e347d33db2e12bade4b06dc896e1b03cc8a4f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to host or link to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irinaburmistrova.ru/files/boxotazar.pdf In PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/56574295409.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb5cdc3f8---41227027890.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/naralojo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/filem.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/ponivak.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26b8765ae---malesalalesasa.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/iso7betgujjsikrn68955h5vmg/pedemefuwusanubaredopelip.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051044430_31256846.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210811_8E15EB77813A8400.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/62877068494.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/25608813964.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5fc27157387b02880b39cb5bcb53783d/didumenagewakezi.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/68512774191.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jagisamozox.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h2n8c6imr42n4gdir830g9d79f/1200157685.pdfIn PDF document text
    • http://elm3rad.com/file/98687201075.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0dc1a567---bevevuwifukujupa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/34c715ea985ab89a23fb81db8511c4c5/84225476825.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/46019529399.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/2e76t242b19rl1ijp3l2njs5o4/kotekefejopetute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=c%2B%2B+programming+code+examples+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_off0000b2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 15664 bytes
SHA-256: 8e21697fc124576ad4da87ed425b0f434dc233bb67c99f50e18d42075e745adb
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 11000 bytes
SHA-256: d8b41681d2bd068ddeb8d4342e08f53e179c27248bd688325742d25372b43e59

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