Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e0e88649367385…

MALICIOUS

PDF

76.3 KB Created: 2021-06-09 09:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c15d6c00c202168e3f625009916c13a9 SHA-1: bc3b2af9898ba970bd79e632ae38bc3623255938 SHA-256: 75e0e886493673854ceb42b73d4008386b5e11b7e2c8651a0fb3980036d89f00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

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://medvor.ru/uplcv?utm_term=the+caged+skylark+poem+analysis
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b4d0c2bd---xuripudezomusug.pdf
    • http://www.euro-fly.eu/userfiles/files/fisusabigomaditukite.pdf
    • http://metaglas.kr/userData/board/file/paperorim.pdf
    • https://247christianity.org/fckeditor/userfiles/file/monina1621466759.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1eada2a592d843a618bdda4a0d2120a0/jukozivowig.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e304884b4a---xewuxejujazutenol.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/48798121954.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a647e922d---78347454043.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d1e2738dcbdbcfbad7443f7db767a726/jegukexamezugurivemitoxe.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91047ecbf---7509615231.pdf
    • http://sola-brothers.com/userfiles/file/7321253254.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbb82877d---girevuzut.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbc20ba25f---jujifilobukuvaxisonezonox.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b918edf2e---wutofu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dd6c52c0a01a57ec8465dea9467b6649/79584692604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c3.bin
7e75a9509d314473100982024383183e9d1314253ee6c848d4c0efbd7d1458fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 5604 bytes
font_01_sfnt_off0000fcaf.bin
8fceba6633d137acc29260a5302fe6ba9d5514b35d8707ba0d6213d50f4fc93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 11916 bytes

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