Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b24c74b5c152956…

MALICIOUS

PDF

118.5 KB Created: 2021-06-28 19:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 548696a71c5bb1e4ee07699fe8cd88ab SHA-1: 8be242b71a18ec82555e8922d8acb1eb0e392d0e SHA-256: 4b24c74b5c1529568b0a40d9bacb87c3ce8fd056b143f30b012c9822614a0592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e36cbpeg9kusk0fbu6r7noqohb/71456697569.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8l027bljuk9irud1i6g8qoq2cu/zazepetegut.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2d4f16b4---14743730278.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a724fb221a---zowebamop.pdfIn PDF document text
    • http://praguetransfer.com/files/file/jigeb.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3ffd73043---japemomanokesene.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0dd1306d26c8e47e0d4525e8b2545c6a/51626958019.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3b3d3eca---boxerulamugukigimemupaj.pdfIn PDF document text
    • http://goldmustang.com/files/files/89213118934.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0de0856331913fe27bf681edda4e9689/58988056486.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/92cupddgp9jpe0ii3vs15hgdbb/nevetupaporajotu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/83882276644.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/firefapimadedeg.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e4c4b75c---51648172803.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/16987505553.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/bawulapulonemubuxu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/tebafi.pdfIn PDF document text
    • https://coevent.ru/upload/files/89302940200.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/366g11pk7egsin58llsg54sfuo/rubilagajapufegeri.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3d53697c5---saworu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/097494dd3d0036cb74321532aac0260c/92256316893.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/72021135711.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/9797134934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gender+equality+between+man+and+womanPDF 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_off0001556c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D83 10868 bytes
SHA-256: a596e1b0ac40211c84a13f4c333396fede467aebdc10ea163f24aad48c7bd051
font_02_sfnt_off0001866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866A 17604 bytes
SHA-256: 998e556a959fef706a7bf3fc7e961edf24feeec2ecf2c9d8b9422513a1863314
font_03_sfnt_off0001b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B430 16616 bytes
SHA-256: 2d7680f10ebdf1604d819353b2a07dcaa93a99c666e0dbef4b201ffc2a29ca3c

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