Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e429d915d74c743…

MALICIOUS

PDF

80.8 KB Created: 2021-10-06 04:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c308b127d9c04a06b67974570388d3d SHA-1: 7003d77f034b23f528ebd6d3638bb7913e3927d7 SHA-256: 2e429d915d74c743221567fbf306f622187ad491b3869473c652032bd82150c3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings are sufficient to determine its likely purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=most+expensive+cities+in+the+world PDF link annotation
    • https://feltshoe.com/userfiles/file/xepokawe.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tumotokakip.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/rovogozirobiz.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e3372a63d6f371d35e4e059f531227ad/fubixisevajisa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152d34417446---badewikixoxajapo.pdfIn PDF document text
    • https://ms2oke.com/contents/files/60949783906.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/80041657849.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/12504991031.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89084bd28---49041114307.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/32663481351.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/68242327437.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/58939410628.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d73d36710---34067905769.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/nojarajebinotaxekube.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/62dc283847181a6540eed5ee9fd35da0/genevof.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/88849098138.pdfIn PDF document text
    • http://onlinevay.com/upload/files/52534302365.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/nafikomubupawijolewusal.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/defob.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/vadofider.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210908052812.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/17446835537.pdfIn PDF document text
    • http://snsi.jp/image/news_file/53705886198.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_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 19308 bytes
SHA-256: 4d960ef154f825e466f5713d1391d938c64590f21dbac25b23d491217ada7da9
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 10696 bytes
SHA-256: e807981b686a0a3795c6fa3d2eee1524b2ba9b8debb5222a9bde1d30fd4788ab