Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c4e162899ab886…

MALICIOUS

PDF

81.3 KB Created: 2021-08-14 23:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9e28d8b54df9c5a1c3be977accd4e603 SHA-1: 4c8a985efd63134faa777c6e0e27dc5bac3be4ae SHA-256: 84c4e162899ab88659a33e62fcb4fdb8d79787d19ce1460cfc8c4b76937738e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://highlander-inn.com/assets/userfiles/files/xuxunemeku.pdf In PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/j3rrf0fb4mk8prrbd9j0nmqdi9/8989818007.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/ligidajonawofujidejevog.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/gekolesaruvuvazitulaso.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/lirapazog.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/xafanuvogewiberijuf.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f3af372a5b24e1c8fa1da4361b0bfab8/59604712964.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b9db3iqcf3794352l56ion8mjp/zejokam.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/medasurazepadulinuta.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/9642224595.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e0334b922b49e18df03f99b85ae4c702/luduwujivofoxaxevokiru.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/92283975025.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62609695---12419014178.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8hie6ek1qre2k956h2vhe9dm93/zevalabivumigodoturu.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/83198983616.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lugivuxif.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/3367222870.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608736b09b190---27631403897.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/vafovegorunofubobumitafaw.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/44f805dae391924b5566e59ff167023b/44614041117.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/rorurawajanabem.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801c3f64500---talozaka.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cchniglrkl3lt2lhufnsc4thrm/93127742589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+get+a+repossessed+car+backPDF 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 15960 bytes
SHA-256: 2e5c1b5c66d51233aba83bcb197df8971a634c1d04b81719c4bf5dbbf4b62124
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 10848 bytes
SHA-256: ab058b11d301cd44b9cc51939aa51d4913fced5e9f2d30f2bdfec8e1c78283b2