Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aee9bfe0e0146c6…

MALICIOUS

PDF

80.9 KB Created: 2021-08-29 04:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19936341000ca487109d4012e4f8239b SHA-1: 081913eb243b1893c0075346413856e9a9d58933 SHA-256: 4aee9bfe0e0146c675c262fa6ad6235cd3acf5227a3285a772d37f294a3a05d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. These URLs are likely intended to redirect users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=zucchini+and+cheese+fritters
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/gmvgthf8n30v3ci36mpnfsqg2d/melunanonewa.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d20d77340---kolataniladozuladipujuk.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/9e2d3e68ed7255a2ecf9c79efcc18d3f/vajavifufiri.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e71f60a42863aebb19e1061096a9e3a8/1105773976.pdf
    • https://idosekotthonaveresegyhaz.hu/files/files/selufebeloban.pdf
    • http://pol2-simf.ru/userfiles/file/5929531205.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/79f5be28828062ed1c2f93c58be2072f/44536702434.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fhghv7obt826tigavp7kuo9504/61999957749.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611878c10c26d---52448726868.pdf
    • http://prestopc.it/upload/file/runekumovuvokafejizitupo.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc75887d6---55056735936.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5b5048f70ec7d01eb0ba03c58ce495fd/gimarebugikubepukiwin.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c6f45f46---tuwumesetegagemibenujag.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9be63482f94f4ba3d382cc537f54e861/nilila.pdf
    • http://ajtoablakcentrum.com/_user/file/vubifazowesidokofefurati.pdf
    • http://grafichesirio.com/userfiles/files/pujutonunowesabuwat.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/amem4ga4muin1jrlujevalsv94/bazejizepopesufu.pdf
    • http://mrs724.ir/basefile/drtiketcom/files/nasolafuwivakozotalejib.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zijiti.pdf
    • http://tuzvedo.hu/elemek/file/81479724382.pdf
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/88998708184.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/dasudabugufawejesedof.pdf
    • http://fixafilm.se/userfiles/file/44711606429.pdf
    • http://biosystech.com/pdsFck/file/54400825974.pdf
    • https://aimara-bg.com/userfiles/file/fisetavakixolasaso.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_off0000d4cc.bin
45aab73ac36db23e514de5960b7fb45ff49cfb26ba4547859a530ec5de77ea80
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 18348 bytes
font_01_sfnt_off000104f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes
font_02_sfnt_off00011d0d.bin
f7172a885c948d86c1d93921ebfa1ae433a43e8123715b337d0e1972e7fe224a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 10468 bytes