Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84f14e4bb04f837…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 05:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60346e4752ce2a862fc93c658d4d0d33 SHA-1: 2291ee5813ed34f783eb63e4df151091e1d37e41 SHA-256: f84f14e4bb04f83791fc051d4c2c5014fa8cc81af6ffe9196203dbd0cebca147
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/887d0b4296d7590e8d87973468a4b43a/74133796310.pdf In PDF document text
    • http://mosvag.ru/img/lib/file/17558078245.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/sudurisupaduwetifo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daccc09231---salomigenolaxizutuz.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/6060220298.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/jaralowagexaxada.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/3894154462.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc08fd96054---zinawuzoritaxonajugudezu.pdfIn PDF document text
    • https://rotitelor.com/contents/files/fizizogukazuleput.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da96dd4d33080e93748b5806b586cf62/8555955096.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/11709994176.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14530bd34---74462791122.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/215e740c7910987cc9fd495ca7993f47/fezajibozabijexebemuve.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/82622707023.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4b7c795f8f39e788115b1d3bb0a490c1/38005357023.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3c8a129c857cf049c07041bea436ff76/lenopedixozopuxisu.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902195431_tu403w.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f557a82d913ed396571a8b5cf41a694f/75446866866.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed3018abcd---69399236115.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/luwomodib.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260607881d---zimewuxi.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b160dfdf---84105641699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=prince2+pdf+freePDF 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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 17940 bytes
SHA-256: 8b1ed20046e62553b0ca672abebb4ffea59b2516be1f382b1eff8f88bc2ea99f
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 10140 bytes
SHA-256: d4a9e421ddc42e2a0b2569799160b854799c99836ee41970a5e2d771dc26be74
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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