Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04568216c62a58d…

MALICIOUS

PDF

140.1 KB Created: 2021-06-07 21:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c69fa730f08bbf44969fbf262041fd12 SHA-1: cdc759ea20b7521f53e45b1daffd4209293260c9 SHA-256: e04568216c62a58de7363998240fef7d3ceaacc0cc27b53133d0a2afe00a8a05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to medical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=what+is+the+most+common+cause+of+hemolytic+anemia PDF link annotation
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c9847d11157d3ff5322c3e6fc1b0246a/zugederopowimu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/26919995667.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jiwolaba.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/demubagozilo.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/d6e75eb1232e3c8df18ee156a815d991/xikutoxipiwu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160845bceb6250---debonoma.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0874aa6dc03e37a635b27c6643e3c26c/69405039664.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9bbadaa97fbcbcfa4daeb5ef33cca1a2/suruw.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ilr11f4a05k46teva88sjqk1s4/sivozetobitosigogulewik.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/60f23900ea878d7dd03ed8ca981d1365/54890220662.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608738ab4bfdf---63660337985.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb59591f73---21677146556.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160848d5e60843---61668151945.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/doposenuguveragasifowiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7BD 5140 bytes
SHA-256: 695f23ccf781e747bb2f82590ad7afc6feed28f52ddbcf50668863852d6954da
font_01_sfnt_off0001f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F92F 12416 bytes
SHA-256: 99de94bc8229b3cdaea98dfc1f150aaddd3b1654453e829888136ba6cc0cd4d5

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