Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb6d86cc68edfa9…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 23:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59c5be71cd7eb612c890bd641ddb9fe7 SHA-1: 97d746aac434f76227d21c332bcd57b5c5da2793 SHA-256: 4cb6d86cc68edfa92ccb136e297b3d62201ada1f022ed49456da9599eed7969d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised WordPress sites and other potentially malicious domains, suggesting an attempt to redirect users to harmful content. The presence of numerous links and the nature of the hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1spm9vq920nnnl83tk3rsadbhk/sevanokoboxemuwelumital.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9jeehk7g3cq6kj1aageq0m5hs6/12218874995.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mbime794p6qkncc61oh0a03mdk/44070604358.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b85df794---67919758047.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/39077279615.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3bda49642c269169ee3c069141b6cd7e/mejavaf.pdfIn PDF document text
    • http://fedoro.ru/upload/file/puzivudomugavem.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/godaxupufabudorubifilina.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/vamutoponulefi.pdfIn PDF document text
    • http://szwygs.com/upload/61245889690.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/082e2e7a61fd7661479792e4e4ce75f4/7179812572.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/sasisujakenabotoret.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/da7bad23228b109cf77d0bafd184221c/21016526667.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3901fc7422a3e7a113a2e8f67e7a4c2/mosixudagubelapelinada.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/13671439245.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab04f76b8ce---90170099924.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/33f65fd542a5baf949ab1324eab235ca/koroxexi.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nadogotatexarifuxewa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b20e9dd1---98230746761.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1664ac1bb6---vefefisunumakidupivezun.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07d1f2c9de9239768243df6a1ee1900e/sujitu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cf9fb44a91ab668692786e5d4e6ba4b2/51659908875.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c01e1115e---kamabixul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ludo+game+in+c%2B%2B+source+codePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/nazumat.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_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 18604 bytes
SHA-256: 89c7f0ed81b6ceff9183a3c658bf8f336bb47e51dfdfa65d46cf9296d54f353f
font_01_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 10624 bytes
SHA-256: 171737bfc0658d996bd977173d4ceb191a33df066e82781df4b78a33f2d9384b

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