Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56c2fc5537f680b…

MALICIOUS

PDF

390.8 KB Created: 2021-07-18 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 72ee87f2eade246b27dc33fbf87d0097 SHA-1: aad3c5e2c01f6fcb5ce421354c26a227ea98fbef SHA-256: d56c2fc5537f680b4c6d124d4abd000108c7d74eb766e22b2c1410c4aa732096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, and the presence of external links indicates an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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.
  • 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://abwlargo.com/uploads/files/gasido.pdf In PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/marijemiretifalasadu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2c7ef3814---rojijobemuxugoremepaz.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abca75e204---66551814447.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/sojijugamazo.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/benobunora.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609071bea0965---51026447654.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8755fcae35---95307522738.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/1035589928.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/23ccf719926bac2b6ed8f235ec67b695/14416040926.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/729174cf6a6bb716ac60526ec8d902cd/vapazabi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160edfddb1ce41---57404749741.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/sapedi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/127ef602f30dccc19bd87b674832646e/mirezosazaj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pg71e0n5lq277ku8pl95qefqo0/44185455081.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/jugafozedel.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7cf35645---femajirarisap.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160991844cf41b---zozetivazidabafogalolune.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85edb53c9---nesusepetudupemisejekik.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/31175992047.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/8voiedpshfnbcahdh65j89d572/buwiwepedeliwew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=understanding+the+athanasian+creedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005ad0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD0A 19232 bytes
SHA-256: 0d9dffbcabb1959b08fd08dc158ea62de07d8295a9dd41b235ccf01d21f5e920
font_01_sfnt_off0005dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD9A 10492 bytes
SHA-256: e0d6d62483af94eece20f9b2620c303d8cb8a65e7195ff2c2bf21e37de7e9cf7
font_02_sfnt_off0005f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1