Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4649fa1420fb86…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 20:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c0630adf9c37f20895362a3e0f6c465 SHA-1: ed4e9a7a72db4e908cf71a79d3a6400a3c0c7f7f SHA-256: db4649fa1420fb861a0ae0bc9c391006f2d861702b65f14d85dc10d732fbbf0a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mimpiindah1.com/contents//files/ganakijuvaziruwaru.pdf In PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/56131504702.pdfIn PDF document text
    • http://proxima-design.cz/files/file/69352844597.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/51735277728.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/95189233335.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0961f55bf19cc0502b5a2a7eea3e0cf1/zasudubujanidifudaxel.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92297f696---nerojukeliganerop.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/sukevigibev.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5p9bfuce3canc5eg2ap0mml5d4/49279994846.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56770ddc4f---63669385254.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/xevotezatepibifobovudu.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/49584046232.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe8676161---12310194158.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/77fdfacddd1e6f9eb755ac39a8920ac7/88396289194.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a48024127f9---49687187299.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/73119891755.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/39214004943.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/30891067444.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/66386688906.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jakabisotikuzawotorebo.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/59315927984.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/32e7762d7d0798bbc4e3b22745d80ba5/67015298110.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/36240794797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=passive+range+of+motion+pdfPDF 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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 16892 bytes
SHA-256: b28f106a903463ed28ad106c47176bcca380df3209dcb59e01458da64644ebd3
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 10860 bytes
SHA-256: 66e14b71f733d2dec07b2d3cc7889d9b4d474f3d37760ef94a93c4c7e48d6361