Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c33c8dbf3b114e…

MALICIOUS

PDF

70.3 KB Created: 2021-08-28 10:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfd2389cbce52b2abf5f3c60c06a48c7 SHA-1: 69f9c0664897c61140b9bd12aa865bea1045d903 SHA-256: c1c33c8dbf3b114eb80d0c11bc294ce5f5da7151b1f08666174e90c5d403d606
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs to execute code. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=online+add+page+number+to+pdf PDF link annotation
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/rabaziduwowupuxofuzodi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/wijojuduvedamegejo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6811c06d8e---kexutarorumiposoje.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gowusojawufeve.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/godajasosaniteje.pdfIn PDF document text
    • http://prosquash.by/data/mizenevepora.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/726784.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vae6dhd5d3vv2ol0v27i3dnh5a/69018892458.pdfIn PDF document text
    • https://superpart.com/files/2122421988.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6556b8a1eda0f2c411772ee7a54e3b89/11149389481.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ac1eebd6---vikepasem.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ab9c60e0de0eedfa112ad088ee1e4890/32672922726.pdfIn PDF document text
    • https://medius.sk/userfiles/file/dovomumorefojinezinuga.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dc480fee45da97d432f110b391571686/niveroxaxolamofu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751ec3c09b5---musiposelavuluzerulalesag.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/tisal.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/3392400942.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f932ae69b---43619053375.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cb719143d1b5522a41a66ff178d6f2f7/40780678212.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/45103718261.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/56856790566.pdfIn PDF document text
    • http://hmed.vn/upload/files/49762835172.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_off0000b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 15168 bytes
SHA-256: 30a09cf63e54d3ff4e387e640c948450a21eff48a0e14a11cd8f5c67064efc1b
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 10940 bytes
SHA-256: 0cb020616cd530da3be3ffc78e1f32503b47e62b864698e87bb727c3b01a964d

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