Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d03ad5534c441f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 18:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b137530d2cb40513f35035d2b8270980 SHA-1: 0ca663cb9eb6231168dbeab2da6f0d9c6fcb9d94 SHA-256: f3d03ad5534c441f5c05c11781b7da75e52400565cd29d2b039248071f5082b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trungtamgiasuhcmmq.com/uplaod/quangtri/files/97072620639.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a410b52714---22918598644.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/10218345210.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/07054d2065aae3e492de7dc4ac70e44e/61130748242.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/36735352607.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/biwozewinewow.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/96204979730.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5ef8927b.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/42baa553c5642d2f7d3355ae1076202c/78671765443.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f8f0557ec8bfb8c0bf52dd1cb888d55a/67771239493.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/dotitofi.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/nawasadonagodixikotutedop.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mumes.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ebce8de58---setuvupasafokivasavox.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/eed0324698c970f9ef1180da86871655/44151140681.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/duxutegizobigaf.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/27i5vttebp1fdj4mg9fursc354/kokewezafafazoxur.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/zujitiwunikiro.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/afd97afc0c8c5fbccc7da70e330b2e33/kumonijawefupuvivedavovin.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/498d807f836c789506ab62989ab76cf1/68337628448.pdfIn PDF document text
    • https://tainandentist.com/uploads//files/202108112048028088.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-18/20210618022126136797.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/nebovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=questions+asked+in+driving+license+test+pdfPDF 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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 11112 bytes
SHA-256: 649eba49ab3259a33fd77e54ea907033a156155879342cc80fd5ccd760fd79c3
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 17704 bytes
SHA-256: f1a3c3addd511c24b5f8692c57a9fddfffdce08764864e5cded6ce7c1876543d
font_02_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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