Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16763620b0dd501…

MALICIOUS

PDF

81.1 KB Created: 2021-10-05 21:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bdb29447d4986db6f2f66db41518de44 SHA-1: 84105e507e421d7f512f844dc935a2a0ac8e8c89 SHA-256: c16763620b0dd5011c4badb15fe3aeb69651c407851f514795114c96ef663b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be link farms or compromised upload storage, suggesting an attempt to redirect users to malicious content. The presence of these external links and the overall detection indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://newtop-eg.com/userfiles/file/86588033754.pdf In PDF document text
    • http://newcityhk.com/userfiles/nipewimovetixegepuw.pdfIn PDF document text
    • https://hale-metalice.com/images/userfiles/vewulotutizemubeguk.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/ziwatebudamalabulixev.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/xabuvineworenutosuw.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/dazaboma.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210927181343.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/sizofizirisevisafababoso.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d591ba386a47aefdd16384770d0f24c8/jefajajeloxiwodogaxenav.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/tirutasapik.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/kagedilobojo.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/solatexote.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/18486582431.pdfIn PDF document text
    • http://thailand.metten.dk/ckfinder/userfiles/files/48945455133.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/59sctic31o2ceiji4hdrtms787/zavuligiki.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/pejapukopazijusavujoz.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cea4556dda---53115661718.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/85857074709.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/revikekonabefur.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/luminoju.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/zatexonuvaxugilidijilarur.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613674ccb32cd---sapokolabipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=on+a+champagne+night+line+dancePDF 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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 18876 bytes
SHA-256: 368bfe616e46c7e5bd34d9200b876787f4022f04860f70d7bfb677a26d7e7455
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 10596 bytes
SHA-256: 8ee5fee73e0ef5ec9f1d0512b6280f55d4ef41405d6312519ddec9053e8259c9

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