Malicious PDF — malware analysis report

Static analysis result for SHA-256 b694c5c5a1ce2bc6…

MALICIOUS

PDF

101.1 KB Created: 2021-07-19 17:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4057d9732e2a7f5f5fcc6a91fe492e1 SHA-1: 245e215eafa0796229ac8267d1be5261586394bc SHA-256: b694c5c5a1ce2bc66098b70d0b5b4c902a4de06e26e8cea66f91bd336f89a1c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file likely serves as a lure to redirect users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://binarbaidfabrication.com/public_html/userfiles/file/93116177988.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0f6470af5fe59a1e8ac244b879825f2/menotujavivobififem.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608de58a552ac---79106631634.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/62277664221.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/69499473221.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab772e82191---48916992226.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/51c801d5e456df23b0a9e2de7c17ca2f/jamosed.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddc20fabf---fakopeku.pdfIn PDF document text
    • https://foulardfotografando.it/file/xewalepetobul.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/gelomumediraruzugolojos.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/81b42e6e13bf0dae976c0579c55cbe02/68390392800.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/43796884146.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/35711980189.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03300dec2c---gazakusojijugojup.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kusozinesazixegirewiteve.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/83461385570.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/savaziboja.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/fd2a2062dd420c07c613f89cffd72eb7/bemopavedisuwe.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/650d10bf85b92ee5e5729a31485ed332/8154186999.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/806psdfd5fjtjro92nvprjvlh0/57791229250.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/47904569e919a71925cdb04474bcba6e/3251348943.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/2961884738.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65d9dd4ad---degusekavewutuzel.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/3636115161.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18c45bafe---robumegi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38e5a3bce---juravefofatopijeruto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+meaning+of+decreasePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010af7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10AF7 18864 bytes
SHA-256: b549b3a2fdf3f9c63b7b290f8146ddca72aaf94f094d72307eefd43661770d02
font_00_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 10744 bytes
SHA-256: 06e6a1d87412ba20f6f59c21a5d218f08e353bd73a0e84391a5578bb15e90a9c
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 4612 bytes
SHA-256: 5aad5cf3544d9d2d98720f8bfed99449f362c28c8223bbf6c15fc3b8eff876c4
font_03_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 28564 bytes
SHA-256: 36c15f0940ee5bbe199f73d46957c064b3ad6aa99b3a6c0817ab4867ed0d95a8
font_04_sfnt_off00016df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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