Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed852979ddc840ec…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 02:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 233435c0ea4f2ee748639fd791a914c4 SHA-1: 33bc9be4e0652cc90f5fcb62ab7b56210631c62f SHA-256: ed852979ddc840ec515c2966c61e9ba20a7f08204a624f64bb2da4ed4fcf8c00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to lead users to download further malware or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://logo4you.dk/userfiles/file/naruvupafewuvagipov.pdf In PDF document text
    • http://playbabydoll.com/userfiles/file/71963276224.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/427b4d339eeccbefbaee88344a60529b/19637526934.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/25691430106.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210915_CBF6F48B501E470E.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/nitelozitozer.pdfIn PDF document text
    • https://rcot.org/userfiles/file/44454055611.pdfIn PDF document text
    • https://maviet.vn/upload/files/tubabo.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/daxuken.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/lidubizumovun.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/8480140482.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/peluvutokizaberob.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/gizuxububibowoxad.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/48292280902.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/21447023604.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/7432160216.pdfIn PDF document text
    • http://weldingplaza.com/files/file/17608022848.pdfIn PDF document text
    • https://shibbirs.com/media/files/51198711856.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419d7659e7e---toxujamulefunigexori.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/33360186271.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/midolaberokusebige.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30548421696.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/jenukibawoluk.pdfIn PDF document text
    • http://telecycling.info/files/file/33846259857.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/fimixarotelijejikilaruwop.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1g363digujkatslomt3unrgh4a/vudoroxe.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/sisatopefexilemabaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+who+visited+my+instagram+profilePDF 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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 11200 bytes
SHA-256: 4a9660ab438287bb78ef5f57af435656fc93602e6ab41c01be9aaee36488b10a
font_02_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 18400 bytes
SHA-256: beab5a3669e3a9ffed9bc9858ce56b55bdd7554b5de02c17043f68b1394961de

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