Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f7868d5f8c28f5…

MALICIOUS

PDF

85.8 KB Created: 2021-08-15 12:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b6a46aa6123e95c3b502fac638c8fb4 SHA-1: 46b03a5d89b2c60e39364f8e30de8eacac07aff8 SHA-256: e5f7868d5f8c28f590c1cd9ef684be1aac3ec5f73b7c451a5d8e0272130518af
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing or malware distribution sites, a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d0aggv56sbhtp40b7eklos0iv7/67406366881.pdf In PDF document text
    • https://angkalaris.com/contents//files/38085333259.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8bcfe0f531b98d80a8ed27a7e17779e5/gewupufapapubonetoxeruda.pdfIn PDF document text
    • http://fkhd.cz/data/img/79925106818.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0cb7de7b---22197501632.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/vexapunirusidireko.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b261828dff5---ginunut.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791b307573b---zusesebivisuninija.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbeb6aabb0f---wuvazera.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/sonew.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/78594632383.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210804_9421E25FC0B0784B.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/21958261947.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7oaoqj54cmbn34mjabo3eidq97/patinapetanepu.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/zezusidetivageru.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ca24b0248eb2db39ed9e3b77bd69f1b9/76461965494.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/23662984325.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4126a69b48b32350211698259d73c953/87342867450.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zejafajet.pdfIn PDF document text
    • https://congchung7.com/upload/file/rekoxipugotejakeneguluwu.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/welam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ps3+gta+5+zombie+mod+downloadPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 11084 bytes
SHA-256: 412313a05fd1a8e150b8c52a21b95e0d689363de5f58e1f245d8ecd2023517ae
font_02_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 18580 bytes
SHA-256: 9007ab57d6602d614aaf56186ef28c99bba64ce385365223204576fa092c5d74

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