Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b03574eedae3f0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 18:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b144af09fefb87abac9970100d8ef59 SHA-1: 8185aabc26169d1b55c1e310f513634f3c3b73cc SHA-256: c6b03574eedae3f03bc6e8d812470daa81888c246183267a5861e3280df5e6c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://breedlife.com/upload/files/nilumox.pdf In PDF document text
    • http://mynigaoe.com/upload/file/20210525080112.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080377582726---nedoniwuboga.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/33188208866.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/9514801904.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/fakuzewemuwizumaxejire.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1701c848e9---15384571127.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/12032518882.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d0d9f38a7---1421680237.pdfIn PDF document text
    • https://areicon.com/images/file/99417680682.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/39853715407.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/piruruzidot.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/36d2625fd179b59f1d7ae170910150e6/70028482375.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/sobura.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/wilevogo.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/domururovinumokedizorojav.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/wufokowiponaro.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/najeralupiwegagem.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019f1a6396---bisozapapoti.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/20df4da2bcd246ce81b7e76ecc2f2e1d/guxifoxupavenitelusow.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c86b031fa---85227445596.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/60422600641.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nukunixupokododolinake.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/37339602985.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16120f81d365ad---39615619138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=abhijnana+shakuntalam+malayalam+translation+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_off0000b477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB477 16488 bytes
SHA-256: 85bdc0279718efbded055b4e8427004d25714f634a0db8b2ba8c73b226c86b43
font_01_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 11188 bytes
SHA-256: 2a9858ae0b0b6b629d171157e7a489175ef786f3450a3ee3a03cc51296250279
font_02_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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