Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce8a19bf8428d19…

MALICIOUS

PDF

82.5 KB Created: 2021-06-26 13:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8e714408c498e5aacbcc8f113cbc650 SHA-1: 6b13192e923dde18c100499bc86d5e52b2664e39 SHA-256: 7ce8a19bf8428d1976caef56ea0ce86d72eb3a3251d17f73c1b443da030e91e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=all+of+the+following+would+be+ways+to+segment+within+the+category+of+psychographic
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f547ed5e5b74f3f4ffd10c59d2f376b9/28576865572.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1d6898b7e---76633871089.pdf
    • https://juhaszautovill.hu/userfiles/file/88944661151.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b280d8a69ff---japokediguvunu.pdf
    • http://liubeauty.com/luutru/files/57404700222.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1j05jm6son9fgeiv2gj10duqm1/zijiminawin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84d69dfc5---19841358813.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/99934752086.pdf
    • http://booklandbooks.com/userfiles/file/mamak.pdf
    • https://fwullong.com/upfiles/editor/files/renoburozalufuzomu.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffefc8ce6a---5779524819.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/hthtcpr91q5jfiqjvo60d2oi1e/kipusuxupajena.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e624607cf---80809949954.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e5567f2---90097056174.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/vomusipigilibogut.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d834593d7---60170136143.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a62c40cfaa98f4ba51577cd1dd53bf23/gosovir.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607776795f253---67458160553.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/skgbsck76ptg3ttkk122m3gfbc/3681136665.pdf
    • http://geodez.com/pliki/file/47392035449.pdf
    • http://botosani.ro/img/uploads/file/41998333082.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a0ab7487d925282c54747c7d1d69766d/24631147484.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_off0000dcc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 16792 bytes
font_01_sfnt_off0000f4dc.bin
042e9d53ff101313e6fb5b17a3b6dfc2620deee7e7da702b3aca49f5b47a33cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 11488 bytes
font_02_sfnt_off00010f84.bin
ae8b34546c015f5f7bc2e6c9fcf7d15323fe61dc031b5bd690b446916413b41e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 17000 bytes