Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03a1339d90f78fb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 00:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20a7a56d382491089510e70e9dc486af SHA-1: da1fbf666c977aca9795eac6046b6dbf34b24109 SHA-256: c03a1339d90f78fb0cc063d51dbb1b3fe56ce5159feb728deb3f1b6dbc4dd30c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several external URIs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://scuderieverdina.it/scuderia/userfiles/file/23814290345.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320e67cd9a7---28453120560.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xineterefiselovumunegowo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96318f6d8---joloxiwemasijotizab.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6240d476713b304c32fc5f42cd7e09cd/35346264234.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/sujasikiwagekilubejeg.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/guluduzakakobajowomunudo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/jijepujexonoboxubusob.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad5133469---sisositewalaxozor.pdfIn PDF document text
    • http://halanmilk.com/upload/files/tavapodadegebisijawo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/34381273840.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/25133414019.pdfIn PDF document text
    • http://househouse.it/userfiles/files/70288841625.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/71015031903.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/ginawevidiwanokexa.pdfIn PDF document text
    • https://sealskinz.ru/files/file/fubagivuwebewatetizukeses.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/eb3eddabe18c927a7263d564f8dc5ff4/83586882161.pdfIn PDF document text
    • http://hejia-ele.net/upload/35396416022.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/61733355246.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zanuwixudadodevowupeviwer.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/23738852041.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/46788450086.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/95124680164.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/43144221453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=balagurusamy+c%2B%2B+book+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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 16084 bytes
SHA-256: 55e6562c4d818b83d94ca73c49abe96fdd0dbd7ae2ee1f838d86500a12171d48
font_01_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 11036 bytes
SHA-256: 39b42f366239571bf14b4a1c84a2e298c9220d70afc48a9f938ae144260d599a
font_02_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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