Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ddc6e55d0b3657…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 21:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a104e9e7c973e673ad381c1b078ef547 SHA-1: 33eb5bfa4e6cda2a6a9ccd002d707a81f5f6e355 SHA-256: 91ddc6e55d0b3657973ac2bdab2f2d86137c6767ce47133f8d4541a17a8ab13a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage. The presence of numerous URLs pointing to such compromised sites suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e8316039---guxupufozojipupupufax.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7da1421719806724072b8cb11ff22837/89719220438.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rbtas3ife5p2hk94a6iusam1h1/63916081027.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e6eaae1f---nawakotolepogex.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/98d10fcf7561285c5eeb45e57bd07423/70172094287.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/61cc09db9761841ac2f2481d5c8f237c/natubotisigeg.pdf
    • http://youngshiny.com/userfiles/file/1624219776.pdf
    • https://preciseenergygroup.com/media/74199617391.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/54mjq31a2eragnt17ihgon611g/28818850747.pdf
    • http://fw-simple.com/uploads/files/58229724977.pdf
    • http://thamdinhgiadaiquang.com/img/files/zujukejirareperetupe.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/59a2af411e4de49d1bf54fbc117b613c/wixeso.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/48bc33a0c705a876a33b6d1f5b5fd15a/33271835029.pdf
    • https://terminal.hr/userfiles/file/62062451667.pdf
    • http://vasvaripalmuzeum.hu/upload/file/bifipoxelodoge.pdf
    • http://espacioschillout.es/images/admin/file/72545841597.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/60424828223.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b30619ec31c3c833279227996f835a4b/pinexilosixotaxaku.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f21fd5543---koxozadiwene.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abaaaf3389---kubivopevegupadi.pdf
    • http://aitrans.org/UploadFile/file/F1202106100913098745.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608165f44b0a3---65848147067.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c6fffa3e399f7c83acdf1434795c7fc0/wibufiwolugefed.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/tipogixuwap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+town+planning+area
    • 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_off0000ecd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 16792 bytes
font_01_sfnt_off000104ed.bin
13caef13ffa3a724f82f6788a590534371fb2c4aad00bc03cad3dc9576b69fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 10324 bytes
font_02_sfnt_off00011c57.bin
fa94e3dfa9ed341be8c99a527cc8fb6d7ae5bb9901e87500fe191e3b1fbb9e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 17056 bytes