Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c90f88a75258697…

MALICIOUS

PDF

79.4 KB Created: 2021-07-05 15:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7857130c24835cc0595bea868df8f530 SHA-1: 18b721d8832c23eca46d66f42feb681e186ace8f SHA-256: 2c90f88a75258697e71daecc0e96defcc21255a5e5320115e2593a8624142408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. This pattern is often used for SEO manipulation or to distribute further malicious content, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://interiorconsignments.com/media/file/gumosigagiladileviguti.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e48a9cea---mabolapilunekupis.pdf
    • https://thietbidienmanhcuong.com/upload/files/22586138789.pdf
    • https://www.profiemg.cz/upload/ck/files/41332515809.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd6841a1f3b7e29f3d13f24329d9fcb0/11318318104.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160755e20a68d0---dubugekopetariwukirem.pdf
    • http://stalmont.eu/userfiles/file/79843126704.pdf
    • http://aquatherm-graz.at/files/wederajinopij.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d287a58b652---vobolapugudajepexejo.pdf
    • http://globalbando.com/DATA/upload/files/202106231216345022.pdf
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/8180352623.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0b4331b9ba3f422427ebb4176146e0d4/97816239519.pdf
    • http://akcjonariusz.com/UserFiles/file/buvudizegafafiparelev.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9582b97d---15923720722.pdf
    • http://dansensvenner.dk/imagesfile///bebulujedubumuke.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc599ba36---9510832272.pdf
    • http://diamond6ranch.com/userfiles/file/43178800039.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/40662028116.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda5761920b---lakumajomepewuvov.pdf
    • https://kisikana.hr/userfiles/file/76847505723.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d685a1aaf---22447235411.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/dodarizudeve.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/motugirezesekak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=java+array+object+to+string
    • 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_off0000d1d8.bin
2a81fb8325491adc9f5cf04c48291464000466e596efa35c70968c38dc2aa2d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 10800 bytes
font_01_sfnt_off0000eae9.bin
ed2d0cdb3c4870c949256d52a6f20f8ed80e0cb30a0e899509613e7ac87cf5d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 17288 bytes
font_02_sfnt_off0001184c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 16792 bytes