Malicious PDF — malware analysis report

Static analysis result for SHA-256 18490fef3c44bbbe…

MALICIOUS

PDF

94.2 KB Created: 2021-09-17 23:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ebfc5f997597308b222fb8ea80a6c1f SHA-1: 2c95424d295fcb6af45964f34a1888836e8403b4 SHA-256: 18490fef3c44bbbe2cc22a665435682d3232b06a1736d7597724a7c6bdbe5eb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://yushendesign.com/images_fck/file/1630542837.pdf In PDF document text
    • http://telegid.tv/userfiles/file/43138130001.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/gofezumuvopitawefe.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/zisuzolow.pdfIn PDF document text
    • http://djapm.com/userfiles/file/14373852544.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210910203251.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc94a8c3c---67186677272.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/paninu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091406451487863.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/7928370319.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/89106557224.pdfIn PDF document text
    • https://hgb.se/filer/file/rexogiratusajomijokokitit.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/puror.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/15484170356.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/44984368086.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6ce430ce370185c9d120ba5e8bc7937/nuforixid.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47fa47812---jitudedutotutulolenono.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/4849860310.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904021942.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/nonokerelijazemanusub.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/37278318314.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kugifezuxo.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/lijojuxokiresuzazix.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/53407417252.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/57502628385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=andy+emulator+for+low+end+pcPDF link annotation
    • 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_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 10804 bytes
SHA-256: 3b04b3d1911aebd3c7e7095923365b39e5a85696e1b29f3e939a4f6770bdb872
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 17620 bytes
SHA-256: 73f2ba0bfd6c3b867da536f0b4abcd036ad62e51f1c152c3ac725ab9aa4185b9