Malicious PDF — malware analysis report

Static analysis result for SHA-256 d054c10e81e0af83…

MALICIOUS

PDF

94.1 KB Created: 2021-07-28 05:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6cd51f04ed4113519eb05af5b102e752 SHA-1: 179a4372c1418a1fac8b6d5373635a65362799db SHA-256: d054c10e81e0af838b963feedbe011065feeaaf24fe2337ecdb6eb9675247ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm hosted on disposable domains, with multiple URLs pointing to PDF files. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ca490eb6d640ff2b2d1bcfe88e209a9d/tarub.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607783e17629a---58685014348.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/63083897984.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/21960337061.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/39919974441.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/26439037754.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/46129081443.pdfIn PDF document text
    • http://dakmet.pl/upload/gugetafigebiwalid.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/pibat.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210708_214134.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/82ac5qc5jv1bm7edtqu484f5gq/87260153449.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/156b893d55ea2862b295327103cc29c2/3969968421.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///fasogibob.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ef9752e247c9512d2365cb69b311f70/tibeturenewowuti.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/52279827880.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16090b717a1234---jumovitajuvivi.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/nufuvogupur.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b34cb9db---23562128960.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/978dfc3a1327b164fffbab746e6fd1f3/57739337875.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/guwenosaletojafogemizo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/149ad64858709e98d5088b63d1eaf61e/rebazefa.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a09208d8---28286385076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=%D0%B3%D0%B4%D0%B7+%D0%B0%D0%BD%D0%B3%D0%BB+%D0%BC%D0%BE%D0%B2%D0%B0+8+%D0%BA%D0%BB%D0%B0%D1%81+%D0%BA%D0%B0%D1%80%D0%BF%D1%8E%D0%BA+%D1%80%D0%BE%D0%B1%D0%BE%D1%87%D0%B8%D0%B9+%D0%B7%D0%BE%D1%88%D0%B8%D1%82+2016PDF 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_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 24296 bytes
SHA-256: fe366bfc693d391044cb2f03971cc43f32a16d4e908398de206bb542a06cc392
font_01_sfnt_off0001323b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323B 12032 bytes
SHA-256: 0a6492811a51f6d0c347b520fca56be43d6b785b081254570c29cb98433fbbab
font_02_sfnt_off00014e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1