Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3550168ced86c86…

MALICIOUS

PDF

89.0 KB Created: 2021-07-15 14:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ac565648e9b66b5cfb8aecd9038f496 SHA-1: 7fd268076572ca53f19d57e3708fac934fbd42e3 SHA-256: f3550168ced86c86752b23237316d096fd4a46de2396aca58c14b1c0a4e6fbbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba4c0a796---86975620855.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071498edc178---3869321760.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c549784c3f5---34813600072.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/afafdf7416b731aaa815154f06c8693f/37891541529.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4b1jlu9c2afiuihh0t8khotgo4/44868559593.pdf
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/fukanafap.pdf
    • https://mldom.xyz/web/img/podborky/files/11560941173.pdf
    • https://wendi101.com/userfiles/file/buburaxugowa.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/m6e8djfnd1pjrp2dh8lugise28/43803860372.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f163dac37be3de79ec2e1207a6421204/nuvufozodibibuwadiduzeluk.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/66c821b24bab8b222e9fcc67cefb7af3/69987686961.pdf
    • http://shipagents.nl/uploadfiles/file/pedazame.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/51acbcaeb6dcb16492aaddfd71156f3b/xiloni.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/g0qj000eedu38uol63df3p5ted/gevoxo.pdf
    • http://apexnepaltravel.com/userfiles/file/pukutitobobo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8b82536c---52449985135.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cd633de7---51738095617.pdf
    • http://www.manorbymajor.com/userfiles/files/zanivoter.pdf
    • https://bselink.com/userfiles/file/kekepevutepu.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e0508fdad785dfcc6cec5638bb2e6d09/95181921273.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+tame+a+horse+in+legend+of+zelda+breath+of+the+wild
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
font_01_sfnt_off0000fb7e.bin
b2a497a726287436c8bb75b05ae45d11c0c914e2961fb1186522f9426560dc5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16816 bytes
font_02_sfnt_off00012728.bin
f455c407cd06e126cc250e8b93a5a7ff65bfc4c40cb669996053bf27bc6c213b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 11080 bytes
font_03_sfnt_off00014098.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14098 16192 bytes