Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fd4151851c2c2b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 09:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b51078dfc4cfed80be3e588f9b7672d4 SHA-1: 15cb234c1fbf31039c15e5e8035bb2102c85b7a9 SHA-256: e8fd4151851c2c2b4ff9b0cbc6b700c38252a0d8f9244c10a4d992c1d600ab73
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute or host malicious content. The PDF itself appears to be a lure, likely intended to trick users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://biogenetec.tw/image/files/20210719_024653.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddf956250a680edb5f331d5381c53002/majixuxogolubopopapu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16110965d8bd73---kaloseluvu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gupavumexurokazukivakosa.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4eac0c015d10e4baba6cee6a3530899a/fojuxusejedosarunitub.pdfIn PDF document text
    • https://shidoremicrosys.com/media/58930063716.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/84722515737.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3dvmj4vr8oinhpnn0k4kbck2e0/gujilafoketegunonoluguwof.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/22173907568.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3a179b732274e6693b3d4c46eca18d15/boroxugogowadiz.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/292b3b02ce3150a7ede9ba5f0c2e2150/regogora.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/vugakeg.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210731_051800.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a2c814cb27b983993ed8569c402e641b/musizesisewavi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3bpdt4k790ejoujo56iuv1531q/dazozikulogevumu.pdfIn PDF document text
    • https://alutat.com/data/file/95196036133.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d448be73fd7---zujuvapakaregapef.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/23525335339.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/63ama6djb8tsopbt7oh4crc75m/37654572608.pdfIn PDF document text
    • https://etimes.mn/uploads/files/wotumelawesofofuwebut.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9gbrj1r7m8ib15oe8dt2g26nt4/nekuj.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/5042707464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=handelsblatt+ranking+vwl+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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 10928 bytes
SHA-256: edddc39fd541ccbecd71c401947c44613edd806d53913c650f469f2b88e1ff84
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 20104 bytes
SHA-256: e3f06147d03fccba66f8ec6c7cee53e5336fee21f2ee9b6902288ddcf73c635e

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