Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbe8ff4ca7d6d78…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 21:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b233df1b8533dbfcf593e5ec4e964a34 SHA-1: 88e9bc1f6c9dec6c64dd5b51a5a4af00d9dbd368 SHA-256: 1cbe8ff4ca7d6d78152aef6e704176782cf3c7b0235fe7c548bb9839d7952804
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 upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=square+root+parent+function+graph PDF link annotation
    • http://aylabawadi.ae/userfiles/file/519151642.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/826189r0ak74uds0eq0eencvl3/furezolas.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/2692548385.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/63280797713.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/53485366107.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/98487696052.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d75173a0b---51444405648.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/pukanozuv.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/2257577183.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421e5b9f833---94279555472.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tajedodaworimesefajepiru.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/linibaru.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/zagazojozuzi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/982eedf24ebc2aaf4a934920a1c01756/36473835878.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/xabusawakulebube.pdfIn PDF document text
    • http://dsraxys.com/uploads/busaro.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a1ba6155daaa7348f471f75aa54783e2/12051441019.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210906_34DBEC21DE362FF9.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pelave.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/14918686846.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/eegniudrh29gdgcn38n27fe552/tifoxafa.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/wutusevovoratovukomonufop.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/jumufoxid.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/65088668692.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_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 10864 bytes
SHA-256: 3a0c95563d98334f9ef1194eae762804a0da2a844833d567db1c7dff1e6a4ee0
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 18024 bytes
SHA-256: 488bade5c98156eb58ae1a55ec5f960861d3e0f0fa66712c518d0f357aa75013

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