Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0b8f74821a5f98…

MALICIOUS

PDF

109.6 KB Created: 2021-08-14 16:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 607299a2981081b02da13f2e2271dce7 SHA-1: d07bd6752537547f2059fdbcf1542547df52751d SHA-256: 0e0b8f74821a5f983a7efc3c933974d19fa41bd553aca4fb7fad44c3c72f120e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to external, potentially malicious content. No scripts were extracted, but the primary attack pattern involves leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=what+is+your+role+as+a+member+of+the+church PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160913e6c21d6a---zufizanazafareroninejozat.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed33bbd2ff---82684751521.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/79562287410.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/rukiwifujiro.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/povudomapi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0482ac3b---45918269659.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2d8047958a0d499ffe17377574aabec9/rexojagipelupivexim.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/84ac2239443393c63af0259526eacb44/zuxuribebuv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096a7aa80765---38519355782.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/kemaxunuzux.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e699cebcff05c6bda9c5a04423bf9c94/94044645093.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50bea9c49---zusiwuvetudaped.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/gokajuwivofujate.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/80363709834.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4ad3a903e501ab1943060017e34e82b0/rijanufeduzonam.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fodaguratudidunideputaxun.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f6976f28---48364217219.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0q03ubvl7amnkk9hbeaip8d6de/mopegimoveluseseduse.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/acji99utibrks4hn8cehhnisbv/16508712270.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/42595071105.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e88e3daa0b36443b11580337477b2220/38063600393.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/rojagewubapabimisatomozep.pdfIn PDF document text
    • https://magatek.com/documents/file/11401370956.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/22743554436.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_off00014a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4B 17384 bytes
SHA-256: d336df932cb6d38ebc243b40879c1190812d0f45f1c746a3c9dc6d8ef45edcbb
font_01_sfnt_off000176b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC8 10844 bytes
SHA-256: 60054b996ef6a79689a910ed08b273ceff25ea4f7b01065ec2cc3755331bc9c1

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