Malicious PDF — malware analysis report

Static analysis result for SHA-256 238409d2c10593eb…

MALICIOUS

PDF

72.8 KB Created: 2021-09-02 16:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bdc7980cb13d4472942881a40d643db1 SHA-1: 75dba81d5878bf2430422ed4c5929e0b6700f5f0 SHA-256: 238409d2c10593eb2a9e92ab2705399ac52033b10ceaa07f2843f61533a4691e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://uniontend.com/userfiles/files/nigifefalo.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a024f6cb4fc---11873533637.pdfIn PDF document text
    • https://anfauglir.com/images/file/wuluparolara.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/sifokigoxejonatalen.pdfIn PDF document text
    • http://foodchemsino.com/d/files/tipaxivoxiso.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/74361540350.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/wuserifiladune.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde3b9e1df1---79797698059.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d06be6d8---nekunitijubibo.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/76511589815.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xorenifexeniseledanogorig.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079f449caf40---mixejiroj.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14f26785c7---gowozogifopiva.pdfIn PDF document text
    • http://ccsl.asia/files/43594574576.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aad3c9b07---butaxofagesiz.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c91c0f546---pizaniv.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/zexojapepezikonupameg.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/23612206640.pdfIn PDF document text
    • https://securitydm.com/slicice/file/fokonelikosuk.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/45540376420.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/si7k25u4k2ab3hb2oecfup05q1/95975369489.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f08825e78---62633897843.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/ralor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=solar+system+information+in+marathi+language+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_off0000b9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AF 16348 bytes
SHA-256: 42767299b2d752ee564c0e84f884fd52fe0c31dd9284ee480743717346268e3d
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 11236 bytes
SHA-256: 48ba5fef9d821687ca67308118f1041d4d383a916b0ba08f841e008060c079d6
font_02_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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