Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c27076b1c24766f…

MALICIOUS

PDF

90.3 KB Created: 2021-06-15 15:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5ef49a8e5cf42e6b79c238d3b55bb5d6 SHA-1: 2f2d7b615a258bb0979fd744ccf5e90861bb649f SHA-256: 8c27076b1c24766fa99b6b5ec113fd4cba87f77a48cd49e8e24290c810f7dd82
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a book title, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=a+series+of+unfortunate+events+the+miserable+mill+pdf PDF link annotation
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/66d43a64ccf5b0f9c7551a29cc37d58b/bamine.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/62ff362e55f1662e7d7f6a582f49eed8/44246205453.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/uotjp89s8oh93d474iu2cr23g6/34496596832.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/ba5467661ee4e601b705ea529e6915fe/97842896463.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/63718qspdteg9i5kcjvjrk5eii/51296891010.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eqficjte76j7hu7ib09h3hau4t/45442162792.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8d4bae684b40df81e18b666f8c86561c/nikidadiwozupujipepudaj.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f960d981---fawapuvewokap.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e831c7b63e6b659025be42a6a1a55e49/48974491169.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_094248.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9a32a5d2---bepuvajedatexidenesi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c9137e6c---10722287782.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef5d1d7f2---poketudejozukikavajezek.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7f8c46d96d9928a99f9de0edb76e6721/wobitonesuwanubefap.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/87499412429.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04528d56a---10790985429.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 4732 bytes
SHA-256: ba7effc9d187e5c26bca2b8dc4a3649e6e2bd76a21670ab1a67ea357514218dd
font_01_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 5468 bytes
SHA-256: 29710c1ccdf5f9b205132840028868d0fda45655dfb3b5ebea7744fb21fcd091
font_02_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 15452 bytes
SHA-256: c64829fda8bf25bfef90ec8bdde3b72a79c7130963e11276dd0877f06ff403fe
font_03_sfnt_off0001462d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462D 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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