Malicious PDF — malware analysis report

Static analysis result for SHA-256 131492a6ed04316f…

MALICIOUS

PDF

90.7 KB Created: 2021-09-13 16:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c8ca6baa3646698ff84c523b26f52cae SHA-1: 50344544b44ad051095c72b60e818c54bcc5741b SHA-256: 131492a6ed04316f50cb58bbc149c7a5eac8fd8c7d4e3ee2d250004a48f1a6b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, some hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://navoloki.mebel18.com/uploads/files/28268111155.pdf In PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/31458477875.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vubusadamavekul.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/51684277672.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210908043329.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/31avihfedfp5uaejfav2ogtmb0/vudilitodifobikew.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/loduzetidojatisi.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/58427627439.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/44196456278.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/79582000176.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac868cf19b---14414360877.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30a386597---futobazebowamexanemik.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/24918274233.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/seketozuvunadagat.pdfIn PDF document text
    • http://zerosquareonline.com/file/buwelebupuzuzosare.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/zarevemijokoverekapapeb.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/7527693902.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/vezuxebowage.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/jipiseforidudugaletukop.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/benidefilezarexu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16130844040e69---finaguxonerataf.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/suviw.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/8714432986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ipad+mini+5+price+in+pakPDF 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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10420 bytes
SHA-256: 113e67ccaa1708ec979b853dfe7ceceb4d5864f29b2747af483ad6d209358afc
font_01_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 18864 bytes
SHA-256: c5b620babc2a3c45a6a051901ea0714b5382a9a99fb09d6559816b201db930e2
font_02_sfnt_off00014538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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