Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82af280703f8605…

MALICIOUS

PDF

95.1 KB Created: 2021-07-05 19:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: def4760211dc8bf9340a9299f6cdc9c5 SHA-1: 1712b52da17a8996f1a6eb46be02dd4be63ba7a8 SHA-256: e82af280703f860598e936bbe8aa3c0675b39fb42d04f66ae8c5d9f656971638
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ac2594da---wukomakofunazowe.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/5267138bde0d5afab617894651e776a6/nutuxifemejijimetekolun.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/235f6d933e12751b9098148a64c9e9c6/nesuxobajadevi.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/gisuxeku.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/wekalimiruxewipoveket.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7c6a27eihkjckric2slsqhp48t/nodakirewi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02f8a9da3---xogikitejomigitupefu.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/81228457877.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160705c4f5377f---reguw.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079acc96a605---49661270964.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073279748372---5660955622.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/tawaw.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/48166358941.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6u1ljk9tlntc9o53heceu36na4/susojawoxisurovigi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a793224601f---xexuwok.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d07748d90---kufivebiker.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7d37e5d6bb0bb859018e65f6ddabd83a/92975406423.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d5796fb7bf01992bc0b06dc7656eb057/66023355885.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/kexok.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/verodotukinowesa.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f3e8d981---dofomazodip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=physical+therapy+letter+of+recommendation+samplePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 11000 bytes
SHA-256: b3d1e985522a0ca95143d0c9f98b0aceda1718a9ab84a864cbf4329deafc61b0
font_01_sfnt_off00012a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A2 17064 bytes
SHA-256: e234cfbfaebe7020cda87613c0a045ed6f17d0de03c2e1ddd0a745be7ea57417

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