Malicious PDF — malware analysis report

Static analysis result for SHA-256 752c1ef5c0b43d08…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 08:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b219e9dd491f9bdc82e85395ccf2bd1c SHA-1: 2917418da8be43cd69c7b637ddbbbeb5dce44a32 SHA-256: 752c1ef5c0b43d084b74c790ce98ab911b8a1af78b205c626715f4a7ca21b414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious redirection.

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://chcial.ru/uplcv?utm_term=rabbit+breeders+nsw PDF link annotation
    • https://laplacedesstores.com/upload/file/sunowagax.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wexeguninutaluvevuraval.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/33541716812.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/kovimirebirebametobuta.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/dosupuvopajojet.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161329aad7533c---tafavodu.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/putunowura.pdfIn PDF document text
    • https://shidoremicrosys.com/media/83988036478.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131274ba467c---nexupewebomanuwosira.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd219d5ce---getafa.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/95062883276.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/56855517555.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/13751862338.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/55446411213.pdfIn PDF document text
    • http://darec.sk/files/files/fumusimuvonivizo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac38231e1---gibimifovuz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7bc878e1c0a2b18bb1bbd181ea405ffa/16853031729.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/lefopago.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/13870952624.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/supenerafuxinijili.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee436dc85---93713994654.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0586b404d97d3f5b4672da32ae2acfb/47291015843.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad5c6bbe1---fesulonutabu.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/52772993596.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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 10344 bytes
SHA-256: 8f743f8c471ae69f1ecca3cf607123902ed5fcbbd769cde7658fe7415640cb64
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 16564 bytes
SHA-256: 1d79f6ea7323da00deaf514a79689521ddf7a61de70b924cdd809873336b982e

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