Malicious PDF — malware analysis report

Static analysis result for SHA-256 541206b9a181fd1a…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 04:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f28a9bf2a888ea850956519a4db2fa30 SHA-1: 1173cbb3ebb21c41b54329b1a17a3d9ae46f563d SHA-256: 541206b9a181fd1ab6da3008c309dd19615e7ff8a5a27085586ee1786d28a92e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laughteronlineuniversity.com/images/upload/files/63350204335.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8eaf0b1c2---roxiras.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ctvmovl88a20tb114tight1ib3/vufasomimo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/13336262472.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/28935870843.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ab0ac9d8---konosofesiruja.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace28ba865a---80926370586.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/1bc6122f0a00acd89831f08974b1ba48/jesetonedafuj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160865d0a26196---98034934687.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1320f0c4---28362491676.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/nilutupisokemukaxomasu.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sapgpisiqhr622qu02552a1994/guris.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/42863765067.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e276704ba7---lulikanevifalasivi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3e7ae60384e9a76ee6430105282ea49b/44733175840.pdfIn PDF document text
    • http://splogservice.ru/content/file/gixiwesibubu.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/notabekarepaledaxezuluwok.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28daa12b91---78190210678.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/mozaxabajebonu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/30895043399.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3c69549a47d2f7b59ed004d7c047b261/76657741329.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052352f21a---64247368449.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79782933e---jijebesedosoroxusetanepok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=not+supposed+to+meaningPDF 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_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 18264 bytes
SHA-256: ec52367cc8b7b895315d10e819d3bdb33d8a44d01965282bf7badd9305fc10e4
font_01_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 10664 bytes
SHA-256: 4f08e1b626c4b590e5f732f0ed0a12a123903b52e7cd05684dc2abed03795a91
font_02_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1