Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe662250cdb3b27d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 19:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2175d19d5d6a611ff90bca10d44476f3 SHA-1: 703c07936f111bc1b67766bcd3ad8daad0bb0667 SHA-256: fe662250cdb3b27d0439380a474a42b7ee2f58def2ae9abe055226b7bdb33f37
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://zhodnoceni-penez.cz/is/images/FCKeditor/File/nemajofarakezagatuseko.pdf In PDF document text
    • http://linpus.com/app/webroot/userfiles/files/vamamunuveje.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/42895462745.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49d9cd09e---ganov.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/bemepuwibumakuguvofot.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/kabojusoxukarijunilebes.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/86411953218.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/32252141629.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/80825968738.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/fedudawixasizefos.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f1d514745705e9f24ebb955c8572faa4/kafaxutevibepixomareka.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d913bb4e8f722335beee117c7afafd36/94342627167.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fadb040ae4023f9a288730a877071545/1705507871.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/51401004346.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/saxojesetokuxenekumi.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210818_125739.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmq42vinbimkdo1413emdl76ii/jafipudamozobu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16093e5fcb13a7---33208024006.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/90d7ec35b5b559f151950838e424c442/96646827564.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/19883299127.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944dc8de934---wavup.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210713040436188.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/devaxati.pdfIn PDF document text
    • https://actor-conseil.com/files/file/fusezagej.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdaac0062a---dobageviwoz.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210722_205634.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/t803d0lqus6mkidq8as5ma1a11/12260739421.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/b5p6qg6mbbegpl1eqhot36j646/lavonakirelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=titanate+coupling+agent+pdfPDF 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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 17656 bytes
SHA-256: 504d01323d2e9b0371d3de52a3099fe400f408bfc50019a97cc682312248cb38
font_02_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 10592 bytes
SHA-256: b5c34dd3e1d6db6b27545209050d17f19874bc72aea87ce3d410adfa7b971656

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