Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07ba826fc752d20…

MALICIOUS

PDF

86.5 KB Created: 2021-07-15 12:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1b83943ab02053a2d5a5b2450af136e SHA-1: 497f33c269a00be9abb1f2dd2d0383822c4587b6 SHA-256: c07ba826fc752d20d5bc63e963bd5c1b0447a21de5cdd916b914a2a578260df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=how+to+find+message+requests+on+messenger+app PDF link annotation
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f81dff3ecd33eb4424a1993bd29f63ea/xilig.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05bb50f6d---95653918369.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b39402b91b8---sefoseziz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1qjf2q84kie6ku6qo03olestu0/lagazojusinexatol.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e18feccf9ab302dddfc35d02999fb8a4/mawalipemedekotom.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c88e83bf27c---vujafekoxujere.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/71287851935.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c5f172f---gususibi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zugeretimewuguzelekugu.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/51119754135.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4dbde0396---zoxufavujapizubixixizut.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/giwamujopewutegekokudebo.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/4990749741.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/tizoxomopi.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ml2mhhkfs6lvbq7eju6iumtbh5/34051747040.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa5bd4e216b---xonid.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/011d2dd6d4da363b9515466d6f42e860/8805466878.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/98460436393.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d65c2e9a4070fe2efc1154289da6ddc1/64864118367.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/22221b2ec1b6986aea9523058ec939e2/11613970541.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60b724b6ec---99129610990.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/58563372875.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/palorowizogabutekokim.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2b830d62---fipowobazotusuzinemuxub.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 17036 bytes
SHA-256: 871dea1e80eb624b6ae24ef18d86686999d99ae6f05023b1490d9f6f1e10fa67
font_02_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 11116 bytes
SHA-256: d8e9164f17d0f781e0eabf8e191e9bebe2d49659b90dfbe3a5d9ce07d5e9769f