Malicious PDF — malware analysis report

Static analysis result for SHA-256 556154a0471a4f0c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 23:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba8a7d2544c72467ed0b2c078aee9626 SHA-1: 9bf285c303260b1be34dccabc2d7eddf87298e61 SHA-256: 556154a0471a4f0c7dd6069829819a0f5eb2d10244e3bce7722fdbac0448cb30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3284aa6ed335ef184179a12abd6556da/duturajagijowijivupevo.pdf In PDF document text
    • http://happyhanool.com/ckupload/files/nozobidajurenin.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/gixumanorojitoxoboxoguniz.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/05dab552014ce32d884f97a9eeee96b5/73259737493.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d512ed3930b---85872651640.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sfutp40gevjnkrk079jme5p7b4/98436213350.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/tusofibifapofixewuz.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/be31f81f796645c17d0a8bb3beb330b3/jomedir.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/k324eidk2o4gcvos3oodsv5d5l/luvonenaluzemosa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d4b32b726cd995be17dec87991495c9/18090044989.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607278fb15647---10347006791.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/duzotasakazubisage.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/fesukinorumuxeruk.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/lototuzalepexobosik.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df973c530eb---pubujesezusoxovazanoro.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6b89e4ff1889374389b9edac63a84067/depogekavojiwuxipifinej.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/89020320948.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/nigarunizezeniporinur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2c11cf52---wafimuxuxogig.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/2p7b8cikqj0lpl5h715qjthns5/devazulakusoxusewu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/79932909340.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac635afa4---folasavenod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+way+to+get+better+at+warzonePDF 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17256 bytes
SHA-256: 8f267d7f0ed0963abb773dc4b9da5b38545e8d6c20936ba2c6d9dc1bab61bf3c
font_01_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 10596 bytes
SHA-256: 2d04f6278b0992ec976852a266e95ed840dc0046b48dbcf1c4718a4a00abd777
font_02_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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