Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca70960b45d9a75c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 22:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9032bcd12459e8a21f6d3fe94aab936c SHA-1: 5e5b9133a1424e2e405e826ffb69ebe11440c919 SHA-256: ca70960b45d9a75cca0d84600e1598a26acd56fb30cf14cb779852bd0b633dce
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lyonsinn.com/nbloom/fckuploads/file/67143598381.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c5ddf512c2a7c601f6225d707727b32b/rerotixe.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/ripitofewabetoba.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3a8f25d29cb8155df70d86b22b61d2bb/7380484844.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/9313024404.pdfIn PDF document text
    • https://taperagi.com/contents/files/bujazonoxawibakegetitul.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d526f050cc2fcb3406f1a879d71b4b26/viresifizava.pdfIn PDF document text
    • http://ministerium.pt/files/bosekanudiwe.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • http://archi-m.ru/userfiles/file/20553971145.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/mugelewimowasozofaxokit.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613149c33dca0---jisedesokebaxejofij.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/wupexij.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/bovavep.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/69478659163.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/fugadarupuxepinalimegabe.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/lovawux.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/dazabemavekajetorimik.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/wuxomenesazeraviwuze.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/64967689911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+set+different+ringtones+for+different+contacts+on+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/38474203074.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_off0000ad34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD34 15608 bytes
SHA-256: 94c4c27b553b5b76c426197df034856acb9c1d61f01176d6e984325c451e16f7
font_01_sfnt_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 10684 bytes
SHA-256: f560b103c84f60242def6b101a5e9fcda750672591c15cd261d876ba41806bc1
font_02_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1