Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fddd7368d8b4440…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 11:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 667971c6d0aa3659d391270351c424c0 SHA-1: 0db81dba60ac9b0a53fc7f507b7bac14d1dd6d8f SHA-256: 4fddd7368d8b44408f772637dc2503d64dfdd7fe4329369f6ddfdabd426df4b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous links are consistent with a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0le55bnf20kpbtupj0a4vqpu5k/43271244091.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/26958474351.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/24e527639a9a4be18506e26273fb0d2e/lobotoz.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/68707tqkfj3o34hjsc71vf7o2g/xiwob.pdf
    • http://webbuilders.com/files/file/92925020041.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72f012ea---35408048030.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ddd6eb5529a31f42360b4da47378f498/wolegososuzel.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/98e4c4177d213ce343d54faac700beb4/bodokevogosadodoferufu.pdf
    • http://gleneaglehoa.org/images/file/67991041160.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c441d2f33b---14356239332.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/964c9596c5cd8b0873220dff6e55601a/muwuzaxivoxi.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28590048702.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/6502787722.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/39769046705.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4ae6fa6695c24656b1df955b12e3aa29/39161053736.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a58115ba4d9---ladusebube.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/db8c2331c54d14463135e5ad2896f6ad/83265076724.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7980a6fd---15311543610.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57eab69d8---zujakofirasovujubax.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/2665467693.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/77547174188.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/638b592c47ba11d8bb2321ac28c2eee3/86506890228.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b1f395de56bc5a50fda0ae1e269104aa/tozekatol.pdf
    • http://rotarylaspalmas.orgdocumentos/file/72481330030.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fb464415faa155c58fb2179f383c9ee5/tagaxibepilononotokuji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=large+numbers+class+5+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_off000102dc.bin
78ef9bf7fe2b71ddae0ee4001656576161769b7bd85e8121d1781f7a41ee7680
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 16868 bytes
font_01_sfnt_off00012edf.bin
1d80b14605bf0d8797f376023117d6b98849fb731f5e10f8e567147354b3106e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 10984 bytes
font_02_sfnt_off000147f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 16792 bytes