Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4d5e66570684b4…

MALICIOUS

PDF

82.5 KB Created: 2021-07-25 05:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a962529131f5dd581e2f498fd2d91fd0 SHA-1: 70a5dbe959176311fbe49c61300e65790f589843 SHA-256: cc4d5e66570684b4d58fc2d7f772f691018964542c8d418f6149ddd6123a36b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://madiran-cruduparadis.fr/ckfinder/userfiles/files/88150614463.pdf In PDF document text
    • http://icsbc.ru/fuploader//file/tekepobudunisubokat.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b80b1a2eeac---70947287992.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/vamozariwivanonozatovis.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/jamomipuza.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/63476793665.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c157e2e9ec3---jepagekudofejifizosem.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/lkdtjbh71jl7fpgsg7l3vc1flb/50020344943.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607989e936bf4---77636688774.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/94816080600.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/l4vb51i21s16md8g7aeju60u3g/1853862584.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tonejuwif.pdfIn PDF document text
    • https://atl-50.com/files/file/11548778055.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/vedosukosedevakutibob.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609270dbd9484---sukasalazofotikasilog.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160849681b4704---50413936707.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/suvogidejuzo.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/55749122218.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862188d08ae---52808331565.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/velimupaxob.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/gukugizaruxaxaji.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986c92e93a9---15230183630.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c487ac4bc70---99128687489.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082192790850---gowaxokizolixovoxopore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=digital+volt+amp+meter+wiringPDF 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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 10580 bytes
SHA-256: cb70a402d83e5240966744f5bac787e8a9e0c62561c68d2787984f8c65c49cb1
font_02_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 17144 bytes
SHA-256: 2d583675760845f33f19b7196e8f064d972cbc23d99e5f398659a0925df68894

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