Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4052a940b3d04f1…

MALICIOUS

PDF

141.9 KB Created: 2021-07-02 05:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dba54ac7a5918a3ff0fcd45ed289d44f SHA-1: 8a9a0e0aa20bcc096a226877d3e068a41801cb46 SHA-256: f4052a940b3d04f15d49ae336cf290e969db75149d84c15f29da899f98926235
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://mfcwestenkwartier.nl/beta/userfiles/file/11695745848.pdf In PDF document text
    • http://tribo.kz/userfiles/File/39439807805.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e3c94d4c544580c61f047c0f5373be8/65251813955.pdfIn PDF document text
    • https://saam.vn/images/content/file/25968190788.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6edf1c4d25---tiremidovelurima.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021616523409.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/29230270722.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c166f11dd8---91875250774.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7889b5c1051601c395e9cf2ec29cdf3e/11241432886.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8ab9bc7d---filolejedusinijojadu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c217b9ef9---68520993785.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/nodojizefexowedipabebakaf.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a9089067---5828093421.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba42ef415---jerakeriraxirabuf.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160947f9157ab9---tevavufowif.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/t0mvino7u79qknarfeejli0nbs/73115718265.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c046110bfab904a71dd340453d58f3af/torivibazetuvebabix.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160965ac7397a9---dubiwagufukibiw.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/7084922563.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c1c033d98d0ba236a2d0fce8d25b53c6/ruvasabimevomokofotep.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0188d0efb0---98080706907.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5c9aff7dbb9bf30fea9132205d5cf02d/84075498299.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cf8f341a08e5e25b1beff1d1ebce8c8d/44736215932.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb59ba0863---nigenupedojaxari.pdfIn PDF document text
    • http://jngf.cn/files/file/lekodol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sexual+idolatry+in+the+biblePDF link annotation
    • 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_off0001bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB27 10708 bytes
SHA-256: e7da8c64247f59131fb246ea71f3ab0ad06336696c710da0d595d85b50cf3a8b
font_01_sfnt_off0001d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3A5 28096 bytes
SHA-256: 4f335255baa74f7e08b20a4be58eb204244c948441289cf81a814c56b3c33880
font_02_sfnt_off000211f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1