Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d395ec44534c0a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 16:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16545dda2943b8255d3bf708633305a7 SHA-1: c68f1af3c65b2d804c38dbd6a5f592ba2a485b2e SHA-256: 01d395ec44534c0a1726d80b4f4df5f720dc5e6d9962b1ac335977eb77d22ba7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and exhibits characteristics of a link farm, with numerous URLs pointing to compromised or disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest an intent to lure users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://selidbe-beograd.info/files/70486857910.pdf In PDF document text
    • http://babamoleskine.com/files/file/35034456110.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/69de58020a66f1b8c2d7f745d979e0d3/dorejovojigetirile.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/65936649289.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/jutisididexulan.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/mowibiba.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/65378082678.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/pikugakafizawozegedorano.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/zoxazakuwogetu.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/linajex.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/95807306441.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/89075228472.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ef6c6ea21036f0ffbef5c093655c4a94/56358042424.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/belosawiwedeke.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/lelarub.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/12916662178.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610535ed622eb---18994098933.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wobosekij.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cgg5gii5df8qlinkboroemrg88/zokanipokijatudokalupod.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/xidoxinamupu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67fde0872---25735468384.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/82636873111.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3793b66bbea46fc1496eb5ee6952611e/fanomunajoz.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/28a1333462ab672b5c46f98a680eed40/puwuvefetibelaxi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255f0743387---kotilokuzaxuzirotekixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=peripheral+nerve+tumors+review+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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 11016 bytes
SHA-256: 98071ccb6ad65cb517bb01564abcb70f358a9dd254b257566db59f27b3ce7aa3
font_01_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 17000 bytes
SHA-256: 44e99f60fa89c4fa9d382eb67f037174724f338ff558c1cf0b87820cdb73ed15
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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