Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ae6bb83a87bce8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 09:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80d83608e1951d6cc3ff985aeb35bbd7 SHA-1: a622e3fcb9963c71cca0a7f868b068bf63e6033b SHA-256: e2ae6bb83a87bce8696bd7856dc8f453a69ffc16f1030f6de96208b0804a2cbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and other disposable hosting. The document body is unreadable, but the structure and URL analysis strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427d96ce0b1---86639442783.pdf In PDF document text
    • https://contact-house.com/fckeditor/upload/file/10120169208.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/65725824967.pdfIn PDF document text
    • http://maksimetall.ru/files/26424883654.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/32470553882.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wofejapinevuluredugu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/4925998248.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/5556129708.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e008664610---66954518047.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/35574778264.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/zejanag.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/20112174714.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6b5cdce---11995892593.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8pr562vg2rlulfq6jst57gu4an/sifegabax.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/23481807237.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/26562887248.pdfIn PDF document text
    • http://vanhacollection.com/images/files/4496278780.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be2a9d393f---bukedejivaxepumifuv.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/tigamotoxusebopoto.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139175f866ac---lopevoxufetovodotisuzitaw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161430036cfc9a---22499962022.pdfIn PDF document text
    • http://kezmosas.hu/files/file/48671545847.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/209298cba039ca366bf1a29858cf4cb9/sonukozubekezexuveno.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/fudukate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=trailer+making+app+for+androidPDF 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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 10632 bytes
SHA-256: 97fa36c9ffabe87968cf23ad4a54177f9cb82f1701b33515870d41143f8f3873
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 17292 bytes
SHA-256: 53b7065e6c6ae95ced44dedc62a1ffc0b1e971631a91e1f88cb2c36a1b5a93ae