Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19ac189ccd0293c…

MALICIOUS

PDF

96.7 KB Created: 2021-07-25 12:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d949c1d9d71dbadecf6a83368fa6be1c SHA-1: be0573b3d276689098e368aecdd3ccbf3d118ead SHA-256: c19ac189ccd0293c5409569779aa006702822d359f998bc0acbaa7fb10b5f457
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of compromised CMS upload directories suggest an attempt to distribute malicious content or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714185558d---99351862476.pdf In PDF document text
    • https://novahealthclinic.ca/userfiles/file/xuwupilapexalarazax.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90c90c452f---zizuleko.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d1f7142341a039a475aff6754f8653f0/39307402238.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/julemutopixijejomukula.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/muguvevenatalexugixifegi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092d9c419532---vomorilagu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086873d4fd33---50791240902.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/minipatilelawufazerogevop.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa06c0c340---bekigamorugojegadi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8479805e---33946042760.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/57616405989.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/49192631921.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/89094515858.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b7e9d7ce---doribasejosur.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/pajedulatalugis.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/dojomawume.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/guwirunu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/38fdb2f5ae42fbe8f1a7acef4a2a9f63/68663759063.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xamesalujanevugumeruzupuv.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/baf3890b52bc8d7e55d0a63ade5226f0/58896856804.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/58888411564.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8bl4n9os41f70udsp7o5mi1ce2/metixapebagatogamidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=el+zorro+y+el+sabueso+2+finalPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 16260 bytes
SHA-256: f48d7ff1b46063ee93b61cce4dce0cf63ceac75c072ed4accd7643607d13a126
font_01_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
font_02_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 10624 bytes
SHA-256: e3ae8095b2f4f5dfb7387a9edd3ee371fdbed46405ca538d5c12ab55193a3204
font_03_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 18096 bytes
SHA-256: 3a26dc2ebf4af1dfea5c5876d55b2db9dc7304a6aa89ba4db22788e27fb33eae
font_04_sfnt_off00015a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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