Malicious PDF — malware analysis report

Static analysis result for SHA-256 0005626c28f17614…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 06:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9b665159964a68ac57c96684f1f686a SHA-1: 5cefd5e58e4ec06a8d62c9cd435a656f6d12670c SHA-256: 0005626c28f1761484c179e6c34c4932c5dd26b61ac1bca7c9bc901ece9d228b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of external URI heuristics further supports the attack pattern. No scripts were extracted from this sample, but the overall structure and URL distribution are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=stickman+skate+battle+hack PDF link annotation
    • http://eiffelflowersquesnel.com/userfiles/file/wonoburujepugisexa.pdfIn PDF document text
    • http://www.pvvc.cz/files/68199094626.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5fff0495fde5f16d99d6a52f7b4496a0/vuwoj.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/nadibejav.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210910191242.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/rexigimazu.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/levalikesutiwenozu.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/36708377785.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaee098bb5---39594873159.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/1334926249.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomeduku.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22084055294.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/32276154768.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/92125961413.pdfIn PDF document text
    • http://njxinbell.com/upload/files/fijawaseved.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/nabeboku.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tb60puj16bt5hcp321j609qb2n/99029030270.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/50239078047.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/62509538815.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/34771234956.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ccc2585---futuriforabasej.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/koninexezapibatapomu.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/96362883654.pdfIn PDF document text
    • https://salwangurugram.com/files/33116926195.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/getepan.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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 17420 bytes
SHA-256: cd306b63eec86c90d057c027b3440197822539eb2e00528420729bdb59ea29e8
font_02_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 10580 bytes
SHA-256: bb77fa1bd7c1ad649f93b2e11acedb4ce5b478ab5b46c16760406afe7f99942e

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