Malicious PDF — malware analysis report

Static analysis result for SHA-256 078d5d58f7c22189…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 07:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6f5f0273c5b36a5915ed1f088fa1bc47 SHA-1: ef24b8f76a1d340310a31af58611cae8dadf1edf SHA-256: 078d5d58f7c2218978467917e04423178337b3bec3b8113ade8699e7a6ca3226
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is intended to redirect users to malicious content or facilitate the download of additional malware, as indicated by the ML classifier and ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.wiz-fac.com/uploadImg/file/vexuwakakumisafikum.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5vsq4bkdgibculh9230ui26096/zuxuwefedop.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/68293072425.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/25859394219.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/33815192375.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072499305e61---41284906053.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f904f35076---watudasatapapote.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0d91c21b---pixelufema.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3e307204c8fa392d5471f61aedaebee4/16432932360.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd2e5d2a---jolexazug.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/26aa3749441c07036f014c0618029fd8/86429285849.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xesesariduzukupu.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/gofaloxerizatudovom.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b277190487d---90422239042.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94b041ebb---nokemigomefoves.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/muxexilo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/zomelilubu.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/6603398131.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099586ad2030---75269903779.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/subemowarutomoxumadav.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/80173651521e95fd586f5076c0bb140e/simojatet.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32ff260c9---tevobajudepoposixejaz.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/46890031251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=most+useful+villagers+minecraftPDF 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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 17672 bytes
SHA-256: cdd72814b514052d52d392995c12b1a385309d6316e4ff2b894c2e46614bcaee
font_01_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 10840 bytes
SHA-256: e07ec83cc4c8f3f4241bdced9123635cd410288f13282d6c71551ff915552f40
font_02_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1