Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8823e7d95c7b5f0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 17:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 589a95f4244e65014826b9660cd2324b SHA-1: 92d557ec2d648e71998e63633507761b04baf217 SHA-256: d8823e7d95c7b5f0bfe49e98d133590fcecf1157913be06581b62b30f4b6ff5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. The presence of a link farm suggests an attempt to direct users to malicious sites for phishing or to download further malware.

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://modern-pro.ru/files/file/91034043170.pdf In PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/legiwox.pdfIn PDF document text
    • https://ckmandarin.com/uploads/16670023869.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/63782000866.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/naxumuletuxugegepoxofam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf4b3becf---10970260722.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/34160815456.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25c5b6643---depavawigoliduvakunew.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/22365095658.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuziviwuxegafaj.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/paxopenogo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24cbe31c8---92897576447.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/04/73883870902.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/sawemisonoxedatul.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/ruxetamenemevemosutubafaw.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/67040723461.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/48992206634.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/36ac95a08896f90e85edfa6481a86129/92114782274.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/divexesepa.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/notalawonesobu.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/90843115885.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3a5f91e7a2305ebd8aa990493d639ac4/rarojafubovimunokigomib.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/punoterudalusubowa.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/4171414211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=prostatectomia+radical+tecnica+cirurgica+pdfPDF 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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 11064 bytes
SHA-256: a34cd3731874370626a87a29b685feac291e4a399af787cfdd2fb38cce117c59
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 18180 bytes
SHA-256: 43df5ce827d76a274d8bcb101b113e8063e32a213d9c1a18ddd909e49a842194

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