Malicious PDF — malware analysis report

Static analysis result for SHA-256 272be1a8ace02b02…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 23:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38fd6a9d6d87f23ba508c29f6258f3d6 SHA-1: c1de733e540a495b6c9769cc417a01531c615ac5 SHA-256: 272be1a8ace02b02507b0d9550ccc277d6238153d2ee48582eb2140101fa8aa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or further malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=types+of+footing+pdf+download PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c9200151---noxexenidaliduwo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160772f449a8b4---tomidutiwodolaromanuxidos.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/kubawagunisu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898eeb7abb5---segumav.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/75861211006.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///57046962015.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/20366463016.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fivuteverutamigoju.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lililop.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/56269648601.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/savupudijovisifo.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/29380031534.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed168bc7618---12968436401.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c3fb360f842f791946ee18a8b89567cc/doloxe.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/36659044288.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wexerejimana.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/wovexefu.pdfIn PDF document text
    • http://www.bash.cl/media/file/nunefum.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119a9d580acd---soperugamenibatimotoke.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/xukaxuxujimiburunijib.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/72704097356.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195a25ff52---47301731526.pdfIn PDF document text
    • https://heyratacademy.ir/file/masiziv.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97470754975.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e18dc8032---butopor.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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 18000 bytes
SHA-256: c76cede9ad0000fae5316cd24cdf0617e8899d0a917305374f180e3a569eea6f
font_01_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 10736 bytes
SHA-256: ecaa054cb9176d80bfb775b0cd6876b65e7dbe31f3a2dfa68a77b185c43f4293
font_02_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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