Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9075e3c9c761f4…

MALICIOUS

PDF

107.5 KB Created: 2021-07-20 17:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 243b1281173eee089e5fe7573444af30 SHA-1: c6cb72f21830b256354d2fcb1da03505071c150d SHA-256: 5d9075e3c9c761f4ce30c3e3c794df1bee570d58bf8dce8b314e53fe6fe8ce19
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malware or conduct phishing. The presence of external URIs and a link farm structure strongly suggests the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://watfordfairtrade.org/app/webroot/img/files/rijikelemus.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083991281b66---pekatumisonikiworuluro.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ukuco7ph03e2dts2jnj554fk4o/miritonebofakegaledafa.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zuded.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58dcac7a4760703b4a051ba05e04f334/wolitugowibebiwa.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/zonojizexovokevixopofuxam.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/27472007527.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/73765cb250a6ef7f4a5570c820ca071e/50066686372.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/99906097428.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zelekokewerafunonimufek.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d380753dd24---38849023662.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mnrj7jt3bi4qttgjugiqqc0mks/17474572370.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085df1c2b8d9---74001803626.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d84a649948a31d26ac91b4b3ecd349be/39056860950.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e3c71cdd---4723702515.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/12800301973.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160897cb9e2ef0---zivexaz.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rerd66h56ai8j7cs1v61p3j1mc/xubefam.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/savawol.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8504c10d2b---votulujalowetupe.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/76223296143.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/81542211792.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tejemonivofinajimabazumen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=square+one+lidsPDF 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_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15954 17976 bytes
SHA-256: 0353c5f5fe8e855dac8120042dd670bfab8c0bb5603abafb3e5c86a08a142565
font_02_sfnt_off00018854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18854 10464 bytes
SHA-256: a9448fa6692a6df07ab157548777c51b1f2f2468ea8b39e17609337f2ce31e0c

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