Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdd719e18086444…

MALICIOUS

PDF

80.3 KB Created: 2021-06-27 23:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d6e59c2c2137b0fa6850492d3ba32a1 SHA-1: 7b090ed33f14f2d342d14d34384fc124458f975a SHA-256: 2cdd719e18086444eeeb0847e6ecc917539b8dd3e44b526a73b8000f0844db95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=questions+to+ask+newlyweds
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdf2102679---pajadax.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7950e05edc---buxaravonavetax.pdf
    • http://varanini.pl/userfiles/file/44640167645.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/gimijafaduromumumitil.pdf
    • http://gialtour.it/themes/userfiles//files/26369572372.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hdbad3vo8aejsta6clptoj3jb7/33005105045.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d066fde0---nagulimowidovapikilali.pdf
    • http://apexnepaltravel.com/userfiles/file/83149484035.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda786be9c7---lufisepadofugezok.pdf
    • https://bleikss.com/userfiles/file/97116869713.pdf
    • http://klubalfa.org/img/userfiles/file/69188172847.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca3eda684---47074982454.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f74e0129---kopijolede.pdf
    • https://299-45.com/CKEdit/upload/files/tomugilofi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ordf3uofbp7q0tpji2pm1v7cr7/benagabusifovobide.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2t68vhnm2agk8hhtkk5d38b6f0/xogax.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/h2cesfhshv5n4osvlhvtjqbb54/16470009030.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4498c09dfbd7c3d16ca57d274eb359dc/meziwexepizoxawekevu.pdf
    • https://hoakhanh.vn/uploads/image/files/52907865983.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/ropojoto.pdf
    • http://domholidays.com/userfiles/file/tuzetewakujegem.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940aac3c87f---37908122889.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc78cfe0e---fanugokikolotenalufijiro.pdf
    • http://dragoniresorts.com/userfiles/soxakeriwuziziwub.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5b39303d---7632896148.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_off0000d7ac.bin
059ef04d86404ce6b8da30f3852c3f00a23817517900b996ec11e701a6230de9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 10592 bytes
font_01_sfnt_off0000f030.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16792 bytes
font_02_sfnt_off00010842.bin
fe7f179500ebf22034b4bd0dd45c772de618fd9baf51b421bda989954892beb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 16284 bytes