Malicious PDF — malware analysis report

Static analysis result for SHA-256 54467f42d0c5f7ea…

MALICIOUS

PDF

89.7 KB Created: 2021-08-29 22:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f80409d90de131afb15b16d8dec8a01 SHA-1: d2999ff398339e687b20e48e18223ba67c6eafc1 SHA-256: 54467f42d0c5f7ea07a2d4abfd1f240d50d1a27274cb979f8b9a8078d82a3eb3
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=synonyms+and+antonyms+games+4th+grade PDF link annotation
    • https://congchungnguyenlieu.com/uploads/files/92608353836.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9e4383ca58e83b6eae9a2fb2861b934f/pifotapamozo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607046ce27466---wijixok.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/40319370536.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j91g1qo1io4g0gp607ovsa2n4d/tojinabuzemivumufewo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/158672e53288fc446eda17d5449d0adc/9519165346.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1d4eaf6416b02732042abedc345e2d60/zogumivikesedob.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6c7e674bfba49e216adfbbebe1dad9e9/zepifilogiweradunotukebop.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/73359036063.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161127405c0916---75168664491.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872297dfcca---72446278573.pdfIn PDF document text
    • https://go2germany.ru/files/file/mukutizejagevepat.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c26f8177c3d---28320559936.pdfIn PDF document text
    • https://brakos.it/file/83666491138.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/26181217908.pdfIn PDF document text
    • http://health-bridge.in/upload/file/suzufadanoxeveloxeg.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94c3e0581---63327261620.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3d8a00d82b52b6eac11fb84e37d99f5b/15437402902.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/177hbi05tkk00gfrtqctjtgl1s/gevelebojilidozafezepi.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/jalasaxibodogilof.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff54fa08edf---92184779064.pdfIn PDF document text
    • http://goref.ru/files/file/19093034082.pdfIn PDF document text
    • https://egf.tw/test2/images/file/35446312821.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fae3d0d0963b255243ecafc271a9d93c/kupobajefod.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9a9c5c78---40849557340.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e572070cd---84689571801.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_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10824 bytes
SHA-256: c92af3f2967e6d53aad6470a70d4f216f7257206c92aba43ce06c69adc40ddd3
font_01_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 18308 bytes
SHA-256: ba5b2c52e1bd2985d7d74711cd2cc682726988d2394545b2d9c6f901b08c51de
font_02_sfnt_off00014178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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