Malicious PDF — malware analysis report

Static analysis result for SHA-256 952442a9d25d1de3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 17:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9898c04bd822c46c8bbfa40afb1a3b94 SHA-1: e13bec7615a7945de2b269e05d2f619016cd1632 SHA-256: 952442a9d25d1de327cfa8323557b79a3f114ce7f35b20901e6f1d1e0b36726d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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, with many embedded URLs pointing to potentially compromised or disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17f7d9bb1---lurupafulokutabaj.pdf In PDF document text
    • http://suliaox.com/v15/Upload/file/2021912459556743.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/rimafivuxe.pdfIn PDF document text
    • http://sambelteri.com/contents/files/dazilot.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/24845012090.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3a0bab0d3075aa3756e5a292e5ea5e3/54826420384.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/589307039.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/dufemugabelemu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613112bf2c0f2---4472159540.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8b6ec5f3218697e1a5e530ea41335c11/vupivixekaboj.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/lopivusixeb.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f4baca4863d8a0e9150123137877e67d/wamalofutajafo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9ab9e03e8cd6a5b8b7f67d7d3e8b4345/77974688101.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/fagizudusewutepizizerotiw.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6dc9c5909b3c6302063af63891a1384f/vanujisubu.pdfIn PDF document text
    • http://baove247.org/upload/files/97361624020.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/18580863239.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/43999506017.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kugikelujoretexulaziwakuv.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/86411190078.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/latifudaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+reset+my+voicemail+password+on+androidPDF 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_off0000c23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23F 17504 bytes
SHA-256: 4734552970528fd0847efd4e074f564da7d28ceb60dcb153088573f773195c93
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 10932 bytes
SHA-256: bb560354a0b2fb7cbbf1397d029a8d882753cead181d9e4ad36b07b612149e12
font_02_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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