Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed342c8e32fbcc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 07:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aac5977c6d43434f4516e3c596846e21 SHA-1: 5deec3256086adf947b87bc44be94c02137534cf SHA-256: 82ed342c8e32fbcc77c2c1c4ee97da7cad04637d7732c951be76648df8a06561
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=english+grammar+in+use+advanced+pdf+download PDF link annotation
    • http://soldearenales.com/galeria/files/94155099080.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/saxulo.pdfIn PDF document text
    • http://unseretochter.ch/images/file/vozavotuliberiwefizatupox.pdfIn PDF document text
    • http://steinemann-ag.ru/rovuwefewuramifup.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/kewiwizafuduxa.pdfIn PDF document text
    • http://normel.org/files/upload/file/98487878390.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c35a633b---68280165827.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/40826054725.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613254df6fe91---59716537613.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/83910466638.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141620b0596f---wapugogotizobisamiv.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/podixejegomegamunab.pdfIn PDF document text
    • http://jinyezi.cn/upload/pejozilowovo.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/bemurejironoger.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/sararebed.pdfIn PDF document text
    • https://novsport.com/content/File/pevivuxigu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wejatubuda.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/36821286970.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/padibivujajaneni.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/aa2b9b67b88ac5cdf2db6067f00f8784/52480313580.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-1/20210901094649241508.pdfIn PDF document text
    • https://menu2uplus.com/images/file/fegused.pdfIn PDF document text
    • http://nemalipics.com/49427374393.pdfIn PDF document text
    • http://bociany.sk/media/file/70090180882.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210906_020428.pdfIn PDF document text
    • http://talleresjpg.es/img/file/99777001548.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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 11204 bytes
SHA-256: 614683af762a89aaae837aab4868be07d2aa07b44b6c5fba3631c003a2543984
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 18688 bytes
SHA-256: eab53bce660906ae20f215f282d05155d17c2cb16093b81586b39084daba7ef5
font_02_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.