Malicious PDF — malware analysis report

Static analysis result for SHA-256 770396c262184ce5…

MALICIOUS

PDF

88.9 KB Created: 2021-07-25 11:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e831030edfd1e79bfc36d60e9fc75b26 SHA-1: b4e4c5cd4b52ae16f8b0f4539a21c176a72256ce SHA-256: 770396c262184ce50e81dd545b16214a8cf6ab4cd70fcce69c917d6edbb3576d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608107d8a77ab---pusarelinuvibod.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def1095ebe3---67501342005.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/14397822164.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083056ad285a---51812476324.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/40701054653.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mizovunasatexikazimugimuf.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/pawur.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/47232579213.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/84477d464bbf8bcff9005a7617da9369/pufufedamezivelodura.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/tosik.pdfIn PDF document text
    • https://appfacile.it/file/bulejebuvokiruteni.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/659dd7b694590edae3ffde462f5255c4/mumavud.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/92632429702.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/bozag.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7h69jvh11napa16m0vei47383m/nomozimazaj.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/nerikela.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3029dhqkhnfnjdo4kehrj5fke7/30693176856.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/fusalinemolokakeboxusurox.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/5879756518.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/67344683865.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e465d04054---44221943167.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/62554386859.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/171d16547baac46bcdac80dedc8dc6b7/disubazapilalulexutabomek.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/57375026840.pdfIn PDF document text
    • http://mcutech.net/files/jafol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mapa+de+america+del+sur+con+sus+paises+para+dibujarPDF 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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 18196 bytes
SHA-256: 7e991a67ceb3cb6d73b45e18c3f4e01595955f4b1007722e3e2e01e1de515f85
font_01_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 10940 bytes
SHA-256: f6330df95a6a598f8b8fc2276a7826866f60c94bdc13e60d81ee2a1c4d52f951
font_02_sfnt_off00013a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1