Malicious PDF — malware analysis report

Static analysis result for SHA-256 d552e477c992eaad…

MALICIOUS

PDF

105.0 KB Created: 2021-09-01 11:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccecdc89762f5f3ec6cbc57777908dbb SHA-1: 6a10e4bd4f681b6a9a6a1d64b4f85155fdf73501 SHA-256: d552e477c992eaad304df929f6150f5ea19e71ff8badfb8656bc5d1cbc1bf920
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 CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to potentially malicious content hosted externally.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://csn-alliance.com/data/files/44447464240.pdf In PDF document text
    • http://ttlh.vn/storage/ckfinder/files/xamekido.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/jaderorif.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608692e0c371b---zowitabisujivaserakedafif.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/34820440444.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608abafb8fb2c---77803368716.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109a6dddd66f---zadezesodasotuxozi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/0fdc177f05f1d0b63ed634336f3738ab/fenuwewajexafegiboror.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/67650235275.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/78638509993.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/273flc3jak48pdj76cd45dk9qt/86619139122.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cbaea2420---golesexe.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/52976182134.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d224785528---tabikoxofesusesebusige.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d8d8a120---77221955191.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/gumenivaxepolewotixevosuk.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ce31e4e80cf421bc63159771c242673c/bajafimaliguwu.pdfIn PDF document text
    • http://www.toptehnik.si/images/21950414650.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ajan9bohrn492rdlphqs0vcht2/zoxinitikedi.pdfIn PDF document text
    • https://tpk-m.ru/files/file/darasawotafa.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b150d680295603402830b09a56cc4b86/lanojotomudum.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/51519283588.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/27655242611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rest+in+peace+to+unclePDF 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_off00013749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 18108 bytes
SHA-256: 5870dd95ff9e666a4c076b15fa97c9c21696c42cf22a36761071232d65bb2b96
font_01_sfnt_off00016628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16628 10412 bytes
SHA-256: c5df351f1a34b3c9120ddf350ed46e35d207c5bd6887ebd955c79e40d7ae7dbd
font_02_sfnt_off00017de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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