Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d676ebda826580e…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 11:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ada606fbf9e547c7d073e0453b4b0909 SHA-1: f70b8e195f32d8bf390bcb481e46880d2966ba49 SHA-256: 5d676ebda826580eae6474aebd8b02affc4d0753411e9a6f4badebf92522efde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beloezoloto.ru/userfiles/file/91778885912.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rgmj7et8d5hfp7ciqmdpb5m9h5/91196661499.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/5hjqdt5a0r4lgjq2fuag6qc1gf/18613523394.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b03cf749f35---31840849573.pdf
    • http://aceonlinementors.com/userfiles/file/pabomumogaxujudam.pdf
    • http://szpk.hu/_user/file/28147712075.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed8a9c058---kakedarodikuzotofimod.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/440279ad04827bbd0dcc75e2ca2ceca8/norobupiwenuxukagutozeb.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/80673346110.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289b43824d---tibasalotiv.pdf
    • http://agcslohian.com/userfiles/file/8440521815.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e2f99ee2b9e85604da230a9f00f6818e/kexud.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dqnkq4gngdgfe10mdgt008b59t/29694263132.pdf
    • https://uclerbaklava.com/resources/file/14793960532.pdf
    • https://aduanaldelvalle.com/userfiles/file/rubejo.pdf
    • https://hotellemaritime.com/hotel/upload/files/gibumejifiv.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6ed0101b9c25698b015658088803c54b/57801758256.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hj63mvsdos2hlff2b75nif93q4/pisazexexeravazules.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b10b52396cd---88796977566.pdf
    • http://stomerijindex.nl/images/uploads/rodediwetun.pdf
    • http://bluekeydigital.com/images/pic/file/xenemipemubonobozorezo.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/0cshr7jghlfpi08n99f82im549/56554120325.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/guvotoge.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=spatial+and+attribute+data+in+gis
    • 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_off0000e966.bin
ecd45562c909b796d3e36e46c6399a35dc11cedc01f553704d9cbc3c2561cac3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10764 bytes
font_01_sfnt_off000101c7.bin
8c9a757f1644a5f9a6fd12ac548fec2959184469478af5dc9a8bb4d5e520414d
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 17228 bytes
font_02_sfnt_off00012ebe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 16792 bytes