Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81dc2dc96c0e6fd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 06:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9910d4393e81c296bade669ec520b562 SHA-1: aea25f14381a890f9d2c4bfea1f59e2bdaab4325 SHA-256: e81dc2dc96c0e6fd6cc559e2228cec604dc0a10d5e4cdbe2cfd03136249640a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.oalysa.cz/ckfinder/userfiles/files/rowaxoxomitodadigan.pdf In PDF document text
    • http://ilkconstruction.com/Images/Media/files/lurinowaxolewe.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/15268551041.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/kuzudak.pdfIn PDF document text
    • https://uudanbury.life/files/file/13113093180.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2aee6d33192f3240f3f2bb65144421ba/belapamulugenuratujabaw.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/60266713159.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/zixenovu.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/muzikujeja.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/80426312472.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/97755989495.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/84983535170.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0738788a---tojirewadukixisinugipu.pdfIn PDF document text
    • https://olterus.net/contents/files/87347109986.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/21644071872.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/24113922561.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109061330226569.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/39961059125.pdfIn PDF document text
    • http://digifast.cz/userfiles/72281498341.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/16686933475.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/82997796230.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161345e812ac2b---62968424963.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/99564707828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pubg+mobile+new+era+apkPDF 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_off0000c336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 17772 bytes
SHA-256: b6f5b06200e46ec5ec6ef994992180ec95cf63afdad8d6b6a8f056f8ebe814cf
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 10748 bytes
SHA-256: 2ab16ede9d95ec5e571793662c703854fdf100cce8c0e4a1ccb73149abafca29