Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2c960f7cf7813e…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 06:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fbc0d4d4d4f61819ad0bded4883ba6c SHA-1: 594ef3e79917e21560325d95b9ed42df29244d9a SHA-256: 5c2c960f7cf7813e358726e9bfd54018d3c376a23f89be40fed7978de985bd7f
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, suggesting an attempt to trick users into downloading malicious content. The presence of a 'download button' heuristic further supports this phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=cytokinesis+is+the+division+of+the+cytoplasm
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1406e282---zovirivotirasixazojomazo.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3977a905---nidizafezarofiloja.pdf
    • http://jedwines.com/cmsCart//upload/file/13113457220.pdf
    • http://kinocosmik.ru/sadm_files/46940773817.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/1acf3434ffbf5341b38fa12443680ea4/nonedekisokis.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/42j0ul4lof149gccu7oopuhpq3/45075467060.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe07a2487f---24437187585.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/d3cdpkcmrravm4b2q4fffhkosj/15943398750.pdf
    • http://mynigaoe.com/upload/file/20210514001202.pdf
    • http://hayatteknoloji.com/webimage/file/muwovazilibusu.pdf
    • http://kaies.cn/upfiles/file/73077362620.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/68879901838.pdf
    • http://forter.vn/hinhanh/file/55440547243.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0a5c4e99---tajawepelebavox.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/39093901827.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/70532201121.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/05255a701bdeed22ea6d2e5c4a723092/31330014553.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b5f9bdf76---jebubibafarigava.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4dae10cfd---kamedajepixebox.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b3cd6ef34---finiminuravi.pdf
    • https://abofahed.com/userfiles/file/xaves.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4c52aff671f1f9fbc889ea228183c261/97656785434.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/panibubawuzurisu.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/fb220307efcf6b7a742e90c77949af43/33542398122.pdf
    • https://cmsschoolkg.org/userfiles/file/zirekipusatetuzenisuba.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc7.bin
99f540e9c2593246679ef6f34ac585f7d34f88de9ca4cf15e81c3f0ad59024cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11088 bytes
font_01_sfnt_off0001098a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 16792 bytes
font_02_sfnt_off0001219c.bin
0534aef7adce9804ab27ea79e1ccda17558e80baf85856e83b3a31b90849bd52
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 17520 bytes