Malicious PDF — malware analysis report

Static analysis result for SHA-256 376e1ecddecd005d…

MALICIOUS

PDF

88.1 KB Created: 2021-08-16 22:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f663b27b00999819c3fbf11b7178252 SHA-1: 3be40eba60a10621ead9f3d5675f6bb3f31aab71 SHA-256: 376e1ecddecd005d5f50ba70d3ed3e95e8578f1d3cebd4fb9d878e5ded4cd40c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malware.

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://coretry.ru/uplcv?utm_term=how+to+create+a+summary+report+from+an+excel+table PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cu1jqq1s39u5fro7f26p0a0ue4/5975323737.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4acdadce3---gisulibexudasuwipi.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/70945228595.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1104dbb5d3---weveb.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/71a1aaabff05a6e35d7a794053d9f667/jodulavini.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/nororozijijusefofimupexev.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/iaotfkd5l442i9npkhc2cbn5j3/1556069938.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1261cbca487d35ae510011298eb6f0ab/vesuvofu.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/15789512163.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/c2pimss99bvpofgna6hrragei7/26960517952.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/welebogamafunorele.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7m9ke4u0l4lu96r04fe5hgv6v7/potevusopipomevipuzolod.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21adac95a---22924261876.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/zofoxizi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9ba9f3b7---wavudipakakim.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/soxiretelub.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c88b47d4b3f3d9b42922de72d1c63157/22753692199.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/wasawotagejabe.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/nf339ib0crff8vu4bf40mhjmd4/xoxepabaduwiselojosadujol.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/94702644262.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/wakazekeloguturufepelado.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/pulizulozozatizilikebo.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/75f335e80de713fbaae5a06c8c0c9767/nezojunozuje.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/temokuzavodefekutofodusum.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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 11084 bytes
SHA-256: aa122a14ed6f12f77a6ce8d5db59503af68ae192d016d6d98c0831c888009df1
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 17156 bytes
SHA-256: 91721b64ba65acea754ff4d2e5e5bbcd4fbffc29e9f2379fff921a690d05551c
font_02_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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