Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84b8fdf19bab54d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9464511b70d086e2e3639310d62cc51 SHA-1: 32a3c9cca99398251bbfd479137e506bbb2712ae SHA-256: e84b8fdf19bab54d6b93541a3cbf50bf661db265743e93ab2a85ea45c8ad8778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, potentially for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=paper+flower+making+pdf PDF link annotation
    • https://wsbtitan.com/images/file/45376602547.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b799aaf06d5---dumaxo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6854aa32e---74559693810.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e6d693f0df5137d9e8af12b6cadc8067/vifamura.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb02b71fed---gapuvaburozawififanije.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/97781271865.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/37445587376.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/83278550226.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/57510982762.pdfIn PDF document text
    • https://profesa.net/userFilesfile/48179620674.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852f451b0b---77111638235.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/buvagotabusowafifezud.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/70427809081.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/21276568494.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/88369980091.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/p4moekipteg688us9ops54rk1l/44656434209.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d271332de5d---85845318601.pdfIn PDF document text
    • http://ahchala.com/img/file/80553655798.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f1e95abb0---94977862280.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/wipidujamirizoduju.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/52453777e278ee03775c12b773a824f1/14955399154.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/12099560867.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/lilomabogubesiwozuno.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608933b0c217b---fatepipatilokogenepa.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609571329b350---47520182815.pdfIn PDF document text
    • 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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 18216 bytes
SHA-256: 8b8e2223b714a37e5576614b250fe0312885d61741fa34b09e694b2895495ac0
font_01_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10752 bytes
SHA-256: 73efae0a8386f745aa86246d47bb0c6742f4ea28e98c9e3e5e28eb5cc051e648
font_02_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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