Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba7b3ba5e60c2dc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 01:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8eea985c485ee3f8451227fe066500cd SHA-1: 56deb4b7fed63f75f7229dc7a56bd3d478527e98 SHA-256: 5ba7b3ba5e60c2dcddf9283a91a56c8cc8e527d2b20dde2c3d53efcd1d5f3d26
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://japan-railpass.info/images/blog//file/newokubidaravuzibin.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732bf1375f5---65221498266.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/74543135765.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/75031655503.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/144dd37d0c028aa0866b04324cbce1bd/ruvinafulelozuj.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cae901a8e---sebosapepajamulepigi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/25240070828.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rco7r35d2tlm3lc4e66tfgunl8/biwatotujes.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f98a570b7---47037153857.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/mobiralikabupazeru.pdfIn PDF document text
    • https://mcdpiti.com/userfiles/files/65479616620.pdfIn PDF document text
    • http://rcot.by/pics/files/43620447460.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37900d4a2b2139a038d7227027de093a/81478611711.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/nofetid.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/97641053650.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/kabafesusowino.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/1705149786.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/rasazulonapareri.pdfIn PDF document text
    • https://e-room.co/userfiles/file/metajulasadipewuvovazusiz.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0mrbuoiuv2remf88fqdsfr2fu0/75871514776.pdfIn PDF document text
    • http://ausafe.net/images/art/files/bodukudumen.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161196b4574f57---fiwulipakudejipur.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vubamidaxuboxixasa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee8d5e396---bokowibovo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdde9063fc---18368382092.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11040a672---3816523094.pdfIn PDF document text
    • https://emprenderem.cl/files/31001245767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+to+do+for+a+torn+musclePDF 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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16856 bytes
SHA-256: 145a0a9ee312d62799895604e6135802ffbb7f4cf6e55d4557299812347eb22c
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 10740 bytes
SHA-256: cf44b892b528c8695f2425198db8e7b1ee918f08e24107ffb91fb2c38dc323cb

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