Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb22f7ea7916dcb0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ba6c170f341e5d85748709e71b90e99 SHA-1: ac0532989c03e16651573f05aa13e80294eda8ce SHA-256: bb22f7ea7916dcb0bf3b4212e5087a5eb2e073a8d7742ea64e824b9edcd9ff97
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure points to a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jtylek.pl/Upload/file/10457183361.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19cd1168b1---78210128733.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7754a5d4c5---duwixol.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ga3sbck644erfr42hpru410gfv/zipelufozasedolufurev.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/11106405470.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/63578792646.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dg2bo3mdq92gfbi0aca6scer63/pawabadutopubefevomofaf.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/76873280979.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a305e317d9c---sabatoruradufinuwowalig.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68743f93f39bf088608bcd7a0ffb4cef/tejufobum.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/dibakafifewe.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd155c5c2eb---lolud.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/622d375a18c76331cb369a5561853caf/redepe.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5bbcf479---30086490320.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/jopad.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609296c0c7c66---kejutotujefotejodegifesuw.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fagisofuge.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/61438988948.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc37360a89---misaxox.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/ruxuberuropu.pdfIn PDF document text
    • http://namngonviet.com/user-/files/17244571978.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/nobutoparuluzajatam.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f8b3868eb8f5fbdf28c37097cf33b52a/bojalalififafafivufagu.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/73854739553.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93b2fc2931d99b3c2345cf5128101dbf/16292380862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lenze+i550+drive+manualPDF 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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 19008 bytes
SHA-256: 58c2b010369912e716d214bea068aa85d5d180f68c68d26cde0db2ded5303c5c
font_02_sfnt_off00012bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEE 10464 bytes
SHA-256: aaa98c5b57043b8d5dfb818de8bbb9fa1ae5b03ff66f977d026b31f2eaedd4bc

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