Malicious PDF — malware analysis report

Static analysis result for SHA-256 215c2317c9ed0eec…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 02:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bd89a9eeb2624a5b80fd62a02473589 SHA-1: e26d140e5b2c317496d2ce7fc6cebed87c221393 SHA-256: 215c2317c9ed0eeca1408d9a8caff298b7076a62ca7680fcbe6a2168bcc62aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of redirecting users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=com+android+providers+media+mediascannerservice PDF link annotation
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953de28258---98848120917.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/12857130116.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/pesodevanel.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/35107878313.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/772j5jr3j44l47n9ub5m5pqku6/29807591655.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/patijapodulotibeluwed.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/josod.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/15931671786.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613888c44689c---zasogulivevidovupag.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/xuzatipexewubodul.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908081751.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/kinivoja.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_A3A0E21423CDC1D0.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/tozowapaniruwer.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/70803559262.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zewakepomilifomulutuk.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/povab.pdfIn PDF document text
    • http://tchid.net/userfiles/file/55268008717.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/bizidomuzumo.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090422423973499.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/baviwofomuputetabu.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/vexinariwefopafixe.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/papegidadexezasa.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_off0000b4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B6 16404 bytes
SHA-256: 0458032ed78189694acb57bc8d8ea2dc5bb2b52fdb55d7773c90632ca70f8c69
font_01_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 10628 bytes
SHA-256: 6b29e1b66339c23051cd25e72e467b856ef0d36864a5ad9a587e9e1acedc666c
font_02_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1