Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daa12684c6eebe4…

MALICIOUS

PDF

86.6 KB Created: 2021-10-04 14:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a95b81a8291a402d2146f18c093beeda SHA-1: 940d6bcfc07d9dcafdb9e351b89fe39cf18e55df SHA-256: 9daa12684c6eebe4a5741a104b96579167541c33b256cebe2dbc56a3b958a7b4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The purpose appears to be directing users to potentially malicious content or phishing sites.

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://krisoc.ru/uplcv?utm_term=which+vegetables+grow+well+together PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30bc5ad2a---3387140491.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/14423389389a5439e892f3574f57ddc0/livodelefokati.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowiweg.pdfIn PDF document text
    • http://talesma.com/E/file/kuxanafojezijoxudinike.pdfIn PDF document text
    • http://duef.ru/public/file/tebuxutodubutorafubal.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/mivelomepifelozirax.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109031525058095.pdfIn PDF document text
    • http://turatabor.hu/media/57535992552.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/kujimiluwezukemuzokof.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/dotelatebija.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/tiwidibukajenudemojan.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/58793453229.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/vekaligemubu.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109211205469552.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xebami.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/59599442730.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3k2v0jloha7q9ahl7lq58qg037/7563280957.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109021545244639.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615231013443e---xaxavemopuz.pdfIn PDF document text
    • https://ags-car.com/upload/files/49869951599.pdfIn PDF document text
    • https://loyd.rs/images/file/23632285123.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/mizugitatuvimur.pdfIn PDF document text
    • https://mama-light.org/business_school/uploads/file/gomaboridozowapilizim.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jivorenawujovepu.pdfIn PDF document text
    • http://dhf-china.com/d/files/87361044814.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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10688 bytes
SHA-256: 6f3e2cd1643cb8220c3d08d7aa8983644195d16a56e55fc5ff45f7decf4d2f8e
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 18248 bytes
SHA-256: 460116dc9766023b7588f2f7e7b4f97a745b84fd28207c69ccad8153982a0e86
font_02_sfnt_off0001342b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1