Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdc5eb8a70fc35f…

MALICIOUS

PDF

76.7 KB Created: 2021-06-18 14:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1da620618350d735d8982028c8c02bbb SHA-1: 1e67dfbf02e47aeb07c92e7a57ddcc621337751d SHA-256: 4cdc5eb8a70fc35f57938bd9924345b014f1714d8d06241dd7ad9c39a8e5c891
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8e7c669e---86439954878.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7adc56d501480b2abf642080c1a5e38b/88901820809.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c63096ebef0---21754794271.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/fekuvukexezagewo.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/64538058911.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f070925666---wafudujifupiwokerijujewod.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8e7c669e---86439954878.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/lukupagopavamifi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e420bbaf38---dafilefebofi.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/betasima.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210521021324.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f7ef2618e39e70ee6256d9bb92daeb57/josar.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/94sqtmaksi3ta27ovt25qje0c2/gezesuka.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c7a2dfd1---darotejigikol.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/fafezarabekazisuriz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac72b88a9---buzusamimuxo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jqr2e60lfghlpbi4bfoosq4jti/fimonobomavu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b0adb19f2918bd0b916e4a1f9012a667/favarazizozut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=i+just+wanna+see+herPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 4848 bytes
SHA-256: d01f24acea309a6d2fe6aa106b830f8c88cf42dcb4636ddf930dd69db4ba10ac
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 13092 bytes
SHA-256: f48e4e610293754077e381f143b69eafc6cdb8d6fa8f8319570ce751eb21b65d