Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c28e9e0c03d1a26…

MALICIOUS

PDF

101.0 KB Created: 2021-08-11 18:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3a1a24e9600d485b6a01ec9e58c8b94 SHA-1: d1adf5f44a02bc0196c15375fac589cdd15035b2 SHA-256: 4c28e9e0c03d1a263c09a7cf10ade71d59f1fa9bce5c8002ec1a324501fb8809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external, potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://efuegypt.org/userfiles/file/37683359817.pdf In PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/98337494.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c7a8b0044---voxiloxezutopibawe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612c6053a5---24730168451.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/13636208196.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68199242617.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/timijesimo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256556a1b3---kakenusomunizabizavetowi.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/28949743333.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/54186732560.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/fudosimotaxixutezatebawoj.pdfIn PDF document text
    • http://accronline.com/userfiles/file/29170206023.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/rovugobisutis.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/48649995193.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/pemikumovononovasokuwo.pdfIn PDF document text
    • https://room12shio4.com/contents//files/xetofekim.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/88cfc53659f21a2555c9b31e370e45f6/galipizidasopipukike.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/843a25dbe042d5bb56a57ac8c70247dc/48072629813.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/rowet.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/nokiboxeguwiji.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0a790a568---73242084547.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/10722019572.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/nufukopoti.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/14/file/20210714_100455_142.pdfIn PDF document text
    • http://arablift.net/userfiles/file/52953157290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what%27s+the+meaning+of+dog+bite+in+a+dreamPDF 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_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10924 bytes
SHA-256: 018a16f450c608b4c475d564fb4265e88e6b1218cd02bcebb6584dfd0a0fb39a
font_01_sfnt_off000140ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140ED 17048 bytes
SHA-256: 1dee4daae7ebeb97bf14a7c2c8beb02768c4f4b8e1e12bf0da51aa04af65ead1
font_02_sfnt_off00016d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1