Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c3e08edf93182e…

MALICIOUS

PDF

69.6 KB Created: 2021-10-06 01:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4370750061b960c249fb5e0f7c3839bf SHA-1: cb480de543c54e79b348ca467515af509955cb19 SHA-256: f6c3e08edf93182e233908b1ee6cc0a370d45629971e404d354cdf39689c8a88
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or SEO-based malware distribution campaigns. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its contents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=mourning+and+mitzvah PDF link annotation
    • http://hicoweld.com/shop/fck_file/file/tusubujukexuwexevaxu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614841ddaf792---zitekarawiwajipa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de17c8b413---xisunobesifojawipok.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/63358583423.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8aa146f27---wolinujomorawunotivorofev.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/vupazok.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210922044504_d0c28r.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/24642758758.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/c5egkpuvkmcg4an31c5dmlfstt/dewuk.pdfIn PDF document text
    • http://cartopack.be/Images/file/pegataweviniwipuwa.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210923_426E2CEBC3F71B2D.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e918631861b1195f5373bfda4bd3a0e/gotuforumad.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/wosewitunoneran.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/65533303059.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615a34feaa6a0---lidaxutepo.pdfIn PDF document text
    • http://vhshf.de/File/nulizogidefiluwejesaxavon.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/farenorizabotabasulij.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e94016066---71951565206.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/59839342349.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/suketubilis.pdfIn PDF document text
    • http://wuchem.com/upload/files/novakifamejoredovad.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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 10568 bytes
SHA-256: 9cef8029cacbd751d878f9834ed6956fe19c4d7127a4fdcf780d770ac56a277d
font_01_sfnt_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 15032 bytes
SHA-256: a14fe77502bde5875c455030128f77d9f88b0918da772fefdec86a2294d28cf3
font_02_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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