Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b53c8303fe8aab…

MALICIOUS

PDF

83.0 KB Created: 2021-07-20 00:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1610c4d53db426d8ad94e278014acc06 SHA-1: 3f1559aba3ed907f5e74789cb9db8e68a0afa4d2 SHA-256: 16b53c8303fe8aabae1ce56c6b3588bc860f5951f8b7f4356f4ee80b311e7008
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, pointing to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/eb4d31793674d79382b55384202599ad/75660051320.pdf In PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5a488d6d8f70abb753a31b3bddb2e27/30534687362.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1795e096c6---wufezan.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/dideximemuzesoboxikogotex.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/bad5c20b0653c591f57c95b9b48a82ea/tusab.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/dinibeterudiwuxib.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c21b8c3f3dc---tifofetolonukodelizi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5242475b1---25649091427.pdfIn PDF document text
    • http://proxima-design.cz/files/file/63777502094.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/41558628697.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910216baa62---3443222995.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a627f22b3---vakalabexaguruli.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf8d5917a---15897256347.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926db876fd---54612061736.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8649b6a7eb54c7aecea8effbe3748329/54635368729.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/lomavemawidokixevafokonu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dk3ir92r775g7nq6tgkai7tuj3/pajupurejutirisidelagere.pdfIn PDF document text
    • http://4appsoftware.it/file/78380521061.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/82184197749.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/70491797078.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/bajuvexaxevobiw.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/41417839680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=topological+data+structure+in+gisPDF 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_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 17720 bytes
SHA-256: 7102c7af86b49d24801e12ac4a350f479a0910bf97460e07286b670f89766edf
font_01_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 10752 bytes
SHA-256: 639bedbd3608f1f9faa393ae52337b8c8579e1cd9675a44f45f3828bf91a9300

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