Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b84504f36f769c6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 13:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0828ee099a1935e6f80be32a32a7bf9 SHA-1: f0472615ba4a2cb9b45aa7b6eafc21f4c3a4fc33 SHA-256: 3b84504f36f769c6a62d8a7246f32dd6d7422f513f02d376caabc1660ae40078
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340e25dfbf8---97120969089.pdf In PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jovanokusibefefexalajezu.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/73208950992.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/nudonivev.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/16805067130.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/22027134293.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/99506646769.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/42293799964.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/gijibagenapufufutudibiva.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/zowugegamexukunonuxideme.pdfIn PDF document text
    • https://ultralloy.net/upload/files/55483852737.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/80825464326.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136439b43a31---48717077980.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/advlgokt1ojf00bp9lruumgem1/suvabewobud.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/puvuwosow.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pukef.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/zipapagekesononeboru.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338e1b5f3a---45900066031.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/89737983052.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/25449229667.pdfIn PDF document text
    • http://speckrepej.com/upload/file/83176283109.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaca682800---lawiwenutujizibug.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/48139221356.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/78626553792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pubg+lite+mp3+downloadPDF 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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 10968 bytes
SHA-256: a551eb7f24bb46aecf2b442ccc6744ff882362b92f994ac3a71c1863638362cd
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 19280 bytes
SHA-256: 2cf42fac8bce2188aa3f55d8bb40977c16faf4765b638cf018ce83ffa020bb67
font_02_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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