Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe59a395ce509658…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 09:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8755da4170ad2660ac7f125188c26b06 SHA-1: 72ad4551e407581524d7d8c3242c6bab6a0e37fb SHA-256: fe59a395ce509658030c0f6bc80e3f6b67959ab2ea3c53f74d4c1fcfb5fbf1ce
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or use link farm techniques. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document is designed to redirect users to potentially harmful external sites. No scripts were extracted, but the primary attack pattern involves luring users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=pie+chart+kotlin PDF link annotation
    • http://aydinservis.com/ckfinder/userfiles/files/4495255444.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090801272415.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/tamibid.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zulofinaxibejurixake.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6452a22e2ce462c4527b7cf2ffa9fd0f/binatofiferiboxewawugur.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/10013924488.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/pokud.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b52c1ae8---36027078362.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f4c2d9444a91af8081d93f34a324e98d/wixikoxomojupog.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/dafirenilarisejaxiwumut.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/ziwuloruranawagijotu.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/koxonaxorilawuvepop.pdfIn PDF document text
    • http://bushurov.ru/images/files/79777343884.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wizugo.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/mipeduzupenuvuvakavo.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/fidutobiraje.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/rinux.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/bovajudefexufipija.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/masiwopimadi.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/fevel.pdfIn PDF document text
    • https://coevent.ru/upload/files/62728440807.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/toselupedakazekive.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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 16328 bytes
SHA-256: f5c50aba4fa82daee5e3ab3103e6b8fb5fef2ab50ae88731428eb494a152d35a
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 10252 bytes
SHA-256: 318119f17d695651b73196d9d408261c69c6176aad4b06dfbfd77b26e367039d
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1