Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b838c51172c5958…

MALICIOUS

PDF

94.7 KB Created: 2021-08-10 06:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48bd287734403c9d82217ce8f238e54e SHA-1: d497cd849094dc2077879cad69c99a040c6f1815 SHA-256: 7b838c51172c5958723689f97e9e9de40f552270ae8736e4eb06e8a1a7343392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c2fbe097ca97c1335bea8cb48360939b/48327916636.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caebfec0fb---ruledimosoxakol.pdfIn PDF document text
    • https://purefeeling8.com/data/file/zorijufakapepapefex.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/36798889319.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f28b47a32---57602292246.pdfIn PDF document text
    • http://kleiberit.ru/files/file/xomunofa.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b71932f1b---93182809850.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/338adf40b14342c3d1aa6c5ed5457e29/39047831831.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734bc5ee98e---53966938937.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3f8a60c58a3e9c26d0c2a2f65dd1792d/pikowuwopizi.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/gqbp41fjtiatg5hv78oe1n0239/66925245578.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/voxevuwali.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/1806147460.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/67698782967.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a0441e5df6b7bcd41ceb7dac448b25b2/lukojijojisukada.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5bbb63921bfe8caa4eadb6bf4e13c811/16149111073.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0fk4hup5phng57mpp1sipeviof/gidasenijijoxop.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/84003266295.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/lemubokewonomurubekuw.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/60692995338.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93fc559a4---47740761022.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081172f7e751---55646151213.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/sonakaxa.pdfIn PDF document text
    • http://servmed.net/userfiles/file/76663767843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+size+is+tv+coaxial+cablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 17200 bytes
SHA-256: b3c53364c6d6940003dbe5320bfa6162ff07d01b1db859de703dfda1d73dee1c
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 10484 bytes
SHA-256: 6b62e6b05de2603046e8c4f0790d150892d9f362e09a36c22923023bccafa8d1
font_03_sfnt_off00014068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14068 16560 bytes
SHA-256: 2aa5a96ae54e5801aaa62690897930820f33ffee5a0266cd1e8e359477592325

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