Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e22fb9ba2488224…

MALICIOUS

PDF

78.9 KB Created: 2021-07-31 02:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 525eeb5d2056e5788d3caecae4f86470 SHA-1: 7bd0a88dca436b5be1942c9bc97b567c86743125 SHA-256: 9e22fb9ba2488224ed2d0a9f6d58f490d394e932d395b636ca6e6fecb39c6423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=les+nombres+jusqu%27%C3%A0+9999+ce2+evaluation PDF link annotation
    • http://wjcopy.com/upload/files/wapirunisepapivewejigabo.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/bajoketumukeg.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/864f199eaffcd6aac6b81f16f60ab527/24072623134.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/41681284483.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/badorovadav.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/12939101260.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2fe3acae6d0fc65a71b1c0db05e8ee0f/21040150313.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085933cf3131---tofetuj.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9gtnsb3jje7hbo323b1b5p7pln/94019058862.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/q4kla45kgtsro0qoak8milikjg/56443739169.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/vuvupilokapazusabolikip.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bd44be94f7a1cd81feb81cda786fd84/komuwujewamizomufubi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/20690032993.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c51be6e97---sigapigive.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kajifatojupelojuxaje.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/kutasepemepanuzonumodiru.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/lifik.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/75671288089.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/88965543449.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/bba5c09d7da1b184054886379703f5ae/govawegogafasatedede.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/65078266236.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b85cb912fe9709e06c6402dc7aa49527/51496529867.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_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 11436 bytes
SHA-256: 2b54d37063fe14a07263f73a0239a284b0f7267ecb23d30caab80ddecdf840e6
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 17824 bytes
SHA-256: ba3c98afd2d141b74a4b28aa4f388b8789d73a10de2a60f5c2bc305759de37fa
font_02_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1