Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4d0ad42c295a9d…

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 07:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 828bed470c04ceffd130184ad2dbde65 SHA-1: 6845e7df87d68a8d11c0a0aed70d526129d51823 SHA-256: fa4d0ad42c295a9d3fdedf0359b1566edfe9c4fd213d7a1b8b26cfcf03c513df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing campaign that uses a chain of compromised sites to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9144ac20d68d10bf999c6cdf601a4839/43728215459.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/gemejege.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a8b151e0bf6d19001828cba4327cb2a8/44191959291.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ej477gnhed4m99hs8uce61rd1/viwabadexikedegesos.pdf
    • https://alajuusa.ee/media/contents/file/76695978208.pdf
    • http://knuhpharm.kr/userfiles/file/20210619051849.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87b5ee4fb---61766909853.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ce3f5524c2f1975bc858e69b3ab026b1/zederol.pdf
    • http://keigan-productions.com/clients/863431/File/95947879973.pdf
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160778069281b4---tarodimamojo.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f15dc7bfc928200a025f266b1c2b4598/29367685822.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf911916b---96230866937.pdf
    • http://ranaghatpchsschool.org/userfiles/file/20208001735.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/pipewibetera.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9597270b---kenuluwifekotefulaf.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/21969971864.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f7a82b94---60930439361.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02914fa2---71446783665.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/64026822167.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50191a4d62---66147337637.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b1f1993a18ce33c19ac12089c6e52853/pamajanus.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p8m40ccgt80092e5omklrh3lk9/bekapemab.pdf
    • http://jpind.pl/userfiles/file/fafajiralese.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083093965dba---22549665236.pdf
    • http://suankaew.net/upload/userfile/files/75296089066.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ladder+of+inference+conflict+resolution
    • 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_off0000ed45.bin
3c4fc2eb0e5f9c6a1995ef7f74bc24cd6cb5499cfd13cb50e7f6167cf17d7d98
pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10528 bytes
font_01_sfnt_off00010553.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 16792 bytes
font_02_sfnt_off00011d65.bin
6ec0a67e5006411f666b4ba31783a67a03e12c7c9197e28c36f132da78be90b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 17100 bytes