Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2ae6033123b09c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 05:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37c52d17572b7ef124f74c198dd9431c SHA-1: 89ccd5249971769063f38aadf3100820ed87b155 SHA-256: 3f2ae6033123b09ced65f5debf163f6367bb330e6b9db32581a25334fe3d61b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=mario+combat+unblocked PDF link annotation
    • http://imosa.asia/uploads/files/202109120713246941.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/33902065786.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/420bfe74349d5927163075ce4a7cea14/63720652796.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/clr80e4bhbdo7r6fbe1sl5j51v/33269058531.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614665afa7124---xijagakuvidepuvasojej.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/sujule.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/29897104434.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/5215433262.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/pewaje.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/62797660216.pdfIn PDF document text
    • http://esteel.my/userfiles/file/dogodozopizasusi.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/89467900704.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/juletebebuzokogela.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/fowinikakaz.pdfIn PDF document text
    • http://gro-felix.si/uploads/1198263019.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/vexojizobozabib.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916045325291.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/85418064708.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/99675910987.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/23596249759.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/80024741877.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xutel.pdfIn PDF document text
    • http://minipit.com/data/files/21250296147.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/45509683362.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/fifavesebesigajanejidapi.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/49450950088.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_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 17808 bytes
SHA-256: 9e08425e84d6ac890e4a66d4e7b632605bfc287e97f9a32bdf67e8375005a1f4
font_02_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 10688 bytes
SHA-256: 2d055a46e3d3cb1f7d130fc91d6a7767231cf0e3e74aece4394e9ca304b93fa2

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