Malicious PDF — malware analysis report

Static analysis result for SHA-256 200b2145c7f15cf8…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 18:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a61e90cedbe53e588162616b2bc40ce4 SHA-1: 87363b553dccc846170ff5f678ffe652b4ea9d02 SHA-256: 200b2145c7f15cf850cee5a7ce9c14bf33db1e98862f9ae2bdd6f870522868c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ut4rj4pcjut2i2ov6972mf57f1/55530922089.pdf In PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_257FF424CC21AAC2.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/fipigajivugiravudafev.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wegerowiferoxizixeme.pdfIn PDF document text
    • https://kimcert.com/E/file/fibukisogavijimufasupeki.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b37aa97d9---kewifozob.pdfIn PDF document text
    • https://kawanmto.org/contents/files/30740090034.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/7909287702.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jrse0hot9gfvb64mgjjs7hfu18/30034257176.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/wujeram.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/88765397305.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3a7007e9ef552f723e8e12982d5c678c/tewegimejanimezobetomar.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/jugefuwoj.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/47090000794.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/fesezaduweg.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/fosapowu.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/79465870201.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/75475120271.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/65682199747.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/47434580000.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/gokodide.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e19cd342---80297852341.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/8787517519.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/81613397922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kratos+god+of+war+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 10352 bytes
SHA-256: ae0d2a6f2f2d124f51889b474cabf9a6b45bf3287fd959355f0c1b460e4f5914
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 24608 bytes
SHA-256: cda002e65efe721b60160f476063b73100fb742b178f7ef6f686cbcbf20adce3
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 16328 bytes
SHA-256: 9211d7707a9e58a1356468c7b05d5c1fd792c35a8cfd89683ef65502033b8d29
font_04_sfnt_off00014dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1