Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1635bd7bbec9ff2…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 10:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 982775437f8c1d90e7a0a1b88b71986d SHA-1: e2ce3807f360fa6a6a20bd674eea9b175ede89b1 SHA-256: d1635bd7bbec9ff26d881d0696a0fc907a999942ce7f78b165ebd5f3d0317259
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=hack+csr+racing+2+iphone PDF link annotation
    • http://market-oborudovanie.ru/upload/file/dirabad.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/sewotesorogolev.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/binexapoxajizo.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/53182600412.pdfIn PDF document text
    • http://grupahatak.pl/admin/_fck_files/file/98528141406.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/nuverarajuzotet.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/wejetezebosusopu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/76084419285.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/46950183118.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155652c11a26---tukadewatun.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/53692591746.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/718e7added5906ba7b1cf0ed91aca142/36047112338.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/lafaxekuxiwe.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xojopegule.pdfIn PDF document text
    • http://chongros.com/userData/board/file/19966253851.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/kalidomabemevenajiwiwumez.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/dagaguluvedomixu.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/jisiwumovuradixakab.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe29a85e98---xiloguvuxupuvakutun.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/57133012868.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/77531489132.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_off0000ac40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 10712 bytes
SHA-256: 258e69cdd34ad32b5c5babf92cf1391a446825a061e17e5eac1d1c7e15098276
font_02_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 15732 bytes
SHA-256: 90c5e5fe6111d2f265a1c683a3ac505d4a22cc51fdfbfca9120c8008a55f168f