Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94bea44d4a415b5…

MALICIOUS

PDF

101.5 KB Created: 2021-07-30 20:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 493f7bf810a7eba7968a63d49f4a24c2 SHA-1: cdef9ece3d2c00b5a7576ecc9a43387e413e98c6 SHA-256: f94bea44d4a415b5fe3ef5000ed86c5fa66f1c1aacde4c9042b43abe5d95d635
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts hosting similar file structures suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c18a65eb3---wumojijatalilapabefexu.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ece543ea0de---fexezomeluledetanurisubem.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/vozozo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1e9cb39c---rivesuxufemamuvavunik.pdfIn PDF document text
    • https://sanidom.pl/img/file/wesuzowa.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zafowedixixomozit.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/petaxidizowilize.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762564bd984---23511910431.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/91355229878.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f516b5ea7ad---31648793897.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce72db968e---70478306183.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61a12edf2---gebenabizixowowemuriruxek.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1cb20237---49652069866.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7f0b66a8f06d873787ac96382bc1f4f3/67187262938.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/3566634581.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/db2218136168cbfc6eeda8e0d3210235/82178979613.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afa24cafa---miwimukej.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdedfc4071---62318824437.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/40517266889.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/lotoxaz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/3ei7r6dussc2vme2ckh0fjll5b/4388076891.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e1d547ff---dukirulubulo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001b3b3674f---rareputuxetefuriju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=%D0%BA%D0%BE%D0%BD%D1%82%D1%80%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F+%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0+%D0%BF%D0%BE+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B5+7+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BC%D0%B5%D1%80%D0%B7%D0%BB%D1%8F%D0%BA+%D0%BD%D0%BE%D0%BC%D0%B5%D1%80+6+%D0%B2%D0%B0%D1%80%D0%B8%D0%B0%D0%BD%D1%82+2PDF 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_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 16068 bytes
SHA-256: 0ca1c6482c514c4264e76f89e64d670dbc4f92285ceb82d7205d9e14c2cca731
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 11456 bytes
SHA-256: 75debd7a37da5202249ee4fd3a11f534a2e9c6ed4e5967c5796af26f043f6047
font_03_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 22596 bytes
SHA-256: d1f897a72c19ac471eb2c1bf9ca161a4c15052892b49bf571a447ce62d04d738