Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ac710c1dd8ebcc…

MALICIOUS

PDF

92.8 KB Created: 2021-06-14 16:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6c4ad00c7463631ae19e94cad5e9628d SHA-1: ed88d10e4ac182006f99c62604a55cf8c561ed1e SHA-256: 88ac710c1dd8ebcc2420305a3e58d3c336f7b7ed9031f700adbd55fe53f695b3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and potentially malicious download URLs under the guise of providing MP3 downloads. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=realer+n+realer+mp3+download+musicpleer PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f249c0a73e82c5d6ca70bbab1899eaa2/lifesudatejam.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2981e2d3---luvowidopo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/1f3fe49027e1ae54d0753df26d8091cf/valizunan.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pewetugiju.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9319715f---58259860526.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/10341528254.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/94132173303.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mk3t9ki8llrolgust0qvla4ol7/poxakiriwa.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/jubinujevasorewudumuzo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2vf46jb39amiles9hchg9qva7v/30052116813.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/nutapemunupijeniretod.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3ce9424d---1912267767.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3586b719---zojenimu.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/95886396518.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/95573517514303fa69155277a224eb21/zotodapubobowoj.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 5284 bytes
SHA-256: 6a1b7a22eb66aa5e6b7d0cefd8d068593e517e9dc98f667e98f626d74d8517d9
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 2320 bytes
SHA-256: 0ae5873f5c39d4b5263e9dc74704783d79d503083e75239f27948d0b2a32d01f
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 12140 bytes
SHA-256: 3edd0924b16e88c92f12b953258a62f0254ed154350ffa585322aae7b3e21511
font_03_sfnt_off00014028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 16656 bytes
SHA-256: c933b7fd3879bea44dbf70d27911e15d451bcd7f8fa7210489d58182114df765
font_04_sfnt_off00015710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15710 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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