Malicious PDF — malware analysis report

Static analysis result for SHA-256 2054fffde17c59bd…

MALICIOUS

PDF

68.0 KB Created: 2021-09-29 01:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 702e6648a04d72fc50d3a67fca72df60 SHA-1: 067419fe93957f1d889ee9fa7d490408000df596 SHA-256: 2054fffde17c59bd37533f1253b3018db209f3ff09c52338bcf4f802a1123ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, indicating a link farm designed to redirect users. Heuristics suggest these links are on disposable hosting or compromised CMS uploads, increasing the likelihood of malicious intent. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=emoji+converter+android+to+iphone PDF link annotation
    • http://yangpupark.com/uploadfile/files/bekeloj.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/tutapejugavamaniperevuke.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/menopij.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/68999882436.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/27546131982.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/niwewomuremenowojoxixax.pdfIn PDF document text
    • https://adikketiga.com/contents/files/50393650681.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/10489837864.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144089086a78---wufefenepulonejupegis.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/bavifikowobixukorokabap.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/80287254117.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/10743634994.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/dibijoj.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/73740919118.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140218323ae8---banuwiwavopunipurekuzow.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tifavowenupagaputu.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/jexewixanizijavidepuj.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/53263200899.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161493c5e90b61---61508521993.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tizamedusoni.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6144D8ABD1E80.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fusev.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pegudatudefililomudiki.pdfIn PDF document text
    • 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_off0000adfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFA 14300 bytes
SHA-256: 94771a7a221254946aa2136b56da158b5351f13c1577d8770f85c692b257106d
font_01_sfnt_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 10744 bytes
SHA-256: 1a993a79fe13f662c2ce9db3a2bf355271b551deacc6dab6b95526f24eaf6822
font_02_sfnt_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1