Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a0de04d87fd8bf…

MALICIOUS

PDF

92.6 KB Created: 2021-08-17 17:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15af39392bfc6e64348e819291317a27 SHA-1: 917d89e86b5470e07c270eeb4149ac5ab97746b1 SHA-256: 57a0de04d87fd8bf2bda9dcd22c8486a7d59ca31d9b7cb7c8b068ec4073f0929
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious content or phishing sites. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=remington+1100+vs+1187+stock PDF link annotation
    • http://amdind.com/userfiles/file/lojen.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6d79ffon858hbshh4tgo9ofdv3/81140518546.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9ba67a26332686759869782fee67c520/81479702031.pdfIn PDF document text
    • http://2440027.ru/upload/file/niseraxu.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/61792720046.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/30939085677.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/novarotun.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164c84f3d9---6155164711.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r3lr833mk3u5a2urmcsbl1aq1o/numujaku.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a9d2c0d9---disuwepobekofovixi.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/kofipos.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/juligag.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01da2c3439---fifabigonubabisib.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/jiluwaxibuzedefuwik.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210724_CD9E9E0CD3DD9FF2.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/12d91ce37678b4f2595e67b8cf938382/wowukuviguwenel.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gidupibav.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/bowonudofitimilus.pdfIn PDF document text
    • https://baongochoa.com/upload/file/32487272397.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/nojomifitisaxeritipaga.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/59701bd22a34f16f0d69e1ad43351fcd/madazexire.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/84523283708.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763c294a02a---fupojulenokixa.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/17166501348.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/ganeragefeboxepigikoxate.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_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 18976 bytes
SHA-256: 125acc9daf941d957645cec138157038588dc2ddbd07c5efbc270ef735a24368
font_01_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 10900 bytes
SHA-256: 2ad69261ea62295d0102e1c483886d0a7b3bb77a5b982002dfedbe59e33d62d2
font_02_sfnt_off00014c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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