Malicious PDF — malware analysis report

Static analysis result for SHA-256 244068c81c0cd5fa…

MALICIOUS

PDF

78.8 KB Created: 2021-06-24 12:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 89db46d44ba6c4a2e66961aca1608926 SHA-1: 379e241e8cbc8104933921357ca0190d0ebb7337 SHA-256: 244068c81c0cd5fa3ac2c06ee1c55e0917b35ec5c6fc7a16a8d4848749870b43
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and is described as a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa7997fc86---kevuxotusejo.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afc60c9c0---31012426297.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2b407659fef514201ced34f3c52edaa1/95482499111.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aa728af555c13871f5386be9a3a9e75c/67363313110.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5375fd26d3150bb8bd37afb9be3d958b/lazonidifur.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b9eeedff82e38e6fb606d4446c7144e0/86543148713.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160acebd699738---2134797635.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a5kp2u91nk35te11g463irk0e4/56910967136.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://bangdientunhk.com/upload/files/99125413120.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38cff4fa55---71568072850.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fuboko.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa087d7e58---lilapudifez.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3eb37373d7fff3bf199fd25417443ac9/71829331772.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/81605015648.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3703ea7809cf8fbe870c0fc136ff11f6/87153688265.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796dd07eef1---dalegizo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7409517e---15433535343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dumpster+app+androidPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 4952 bytes
SHA-256: a0037c7554608ae99db2483b7e39ab26a772dae66babe8962589ddd6c2288396
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 11100 bytes
SHA-256: 5fd4d3ac5b4f33ef420e3eebd24f4ec210f8e6258702b37d2789ec4f602597c9
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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