Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b325a696582cd9…

MALICIOUS

PDF

82.7 KB Created: 2021-08-22 00:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e8a0f06be489a18863969134ad03ab8 SHA-1: e1d670b8cfa45a5976655c92d2d9c169d74005a1 SHA-256: c0b325a696582cd92db6203c786df80b233f088e8e7899a4139a6474cde4f8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of many external links strongly implies an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=ancient+roman+manuscripts PDF link annotation
    • https://mavibusiness.it/file/vozalofagirijarurigow.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/87q5fnkg4fjl2m6fffhmnq3usl/vuzedemijitonafo.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/98909580036.pdfIn PDF document text
    • http://opersan.com/file/60660095199.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/121f40007309edd07bcc60f48a218ad0/devirisolu.pdfIn PDF document text
    • https://stopserv.ru/files/file/77352589663.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b11285199---zifugapabewefo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/484365897006185eb6fefafc138299e3/37587514767.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/01c74d874a4844474fce79e156e60636/66902239200.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/59741683605.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/c45e2440088778f7aa7a70e9cab3aa8c/degiges.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/81409342973.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/31730321161.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/kolul.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/43408278358.pdfIn PDF document text
    • https://bnovum.hu/downloads/funewod.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a341469cf---gamexanasovesatevifu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b163a6e78af---togeb.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ffa39743da---kanopaxazowusikeriputevo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fce75a76915af890756a74676d82f85f/nomevuwigogiwoni.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e824915859e5a11ff47b555645c90a38/nesudusasuwijajeli.pdfIn PDF document text
    • https://mvservice.it/file/54756433749.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/sufamawunasabuzopejemetum.pdfIn PDF document text
    • https://retta-bg.com/userfiles/62238958483.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/92c25e1f7d963c7c8b095080f80cb94e/31600399176.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/64973215850.pdfIn 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://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_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 10568 bytes
SHA-256: eb3239899dd6be9cb1bc7473d7278242f916493a52659978a16ddad6c96c8f77
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 16704 bytes
SHA-256: 34d8d4c2cd1ee0eda6fd27091868ca0cfa3384655ac2d0abbec0703f67f4c011

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