Malicious PDF — malware analysis report

Static analysis result for SHA-256 8497a0e7d7bc8c5e…

MALICIOUS

PDF

83.3 KB Created: 2021-08-15 05:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ebc8229e0b47db80bcb473055f7841d SHA-1: 2bf00832f631ebc732f5c3dd862a0f98b8858530 SHA-256: 8497a0e7d7bc8c5e38ededa448b914801862082e51caddddefa2348f030462e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=myrna+laura+ponce+mayorga PDF link annotation
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bc5ec60b8528885351548631062d568a/18481024876.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0524a237---40633264151.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f70bbac4---seratusotelininez.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/riturejefokenix.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/24346005585.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5cb4b12e240ed8ea4ea46236835dd6d1/2427427228.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4548b41522---90344280185.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fozemumafovizezi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040c56cebf5---13588640518.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0521834001627683651.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accd52ead4b---gufitugadubux.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/36164940769.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/277166e071fbf19e3d2f1158b1d63b14/kadidanesowib.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/musaxomisaluzuxegidavis.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/sijetemubopijisinasaf.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dsj68k3upghtiitok6rh8us974/vasoguzaf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652ea7ea02---sutaxojuxul.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zasijezugekafifepozejes.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/47670684070.pdfIn PDF document text
    • http://afro-safari.com/upload/files/gasixutokitaxujeradakew.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210713154300.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/62712393478.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/91811883067.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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10564 bytes
SHA-256: fcb20198591bcb9ada193291d3858098c356662cb4eac9dab298c3a5be856dbb
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 18040 bytes
SHA-256: fceeb5b646e12725bb47d687aaf154a760a2163fc6437fe16376e7f590f2710d
font_02_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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