Malicious PDF — malware analysis report

Static analysis result for SHA-256 378a2e0464d6567d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 00:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cea33b4c447cbcfe9c643898f3c6246d SHA-1: 1657488d462645c392b21ef53dc0ad912857e230 SHA-256: 378a2e0464d6567d0cabc99687da96e49dff701e9fe14cad496a2801005b7825
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50748581457.pdf In PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fktbjmeqvctqv17ldcvhteo380/xalovukefujutitedamisopi.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/titivigag.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/52081474222.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee798d9350---fezotapamutokezogi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5add51db07---vejejamebunow.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/65937693785.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/xenuled.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/67210271329.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rapigip.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/5509674026.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/sabarowizapesaledonawe.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37582992956.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/xunugojarebasizegi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f8595811---sukedeke.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8adb3b129ea2297aeddf916a2c6e8744/28106304371.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/sarevumusitajisebive.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89bd28036---lijewiribuwojol.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/31941412578.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/33e2c8072343d5a1a3f07269b2c6f3ca/9730514046.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/wiluforuwezesajupezosa.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/posokexozevonobemirumi.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/dukuguliluboxenakud.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/3203233136.pdfIn PDF document text
    • https://schmitz.cz/res/file/pojirererapaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=subepithelial+mucinous+corneal+dystrophyPDF 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_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 11208 bytes
SHA-256: fe3e1f011cfeda006909acc6d51f78b525c62144c14c19e00ccaba6aa9c7e90d
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 19328 bytes
SHA-256: 5002c7cfc78509ab0c3158938d174a95ed7d4f969cbe9a0c7c905058caecceb3
font_02_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1