Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc09f951bf948e41…

MALICIOUS

PDF

90.3 KB Created: 2021-07-31 14:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b16260f92132cf88b8bf92341b6ca119 SHA-1: 7ff3aa38b9b796230ba656b24aca1bcd06dead19 SHA-256: cc09f951bf948e4198a0c630fe17b8563cc7b9db5e5cf068c361266c8aef8608
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further support this, highlighting the use of potentially malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chistogood.ru/admin/ckfinder/userfiles/files/tiburekoxidewelome.pdf In PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdfIn PDF document text
    • http://gapp.fr/medias/files/23344792998.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e84e5f5e---1781189560.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53b85d2edf---romotabokawojuvisodifoj.pdfIn PDF document text
    • http://webursitet.org/Files/file/41765780833.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/30193066771.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/95325830580.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9ffe6292948b8f3e31cc9066982237f6/xikafatafoz.pdfIn PDF document text
    • http://ktcz.eu/files/files/dufusunepimurutunoso.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/lefeketurixuderufu.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/24159552170.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a021b18c37f851333efd0964b673da30/33041346867.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fcebe14d54e---87356021249.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/66443030574.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891a0e360c6---zuguxitakufi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zuzufogudinokixulaza.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a180ce37c7---xifemaw.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada80ec9ab3---41966028068.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd77da428a---tolizavumekada.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7dcf7eb1c8f7d4bdfe8b756360d47e5f/wukifudilu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j7ibpknq436v1m7ptf4pcbaq2u/joxusufitaxu.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/nusefulejave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+blend+single+stage+paintPDF 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_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 17388 bytes
SHA-256: 10e88f0fc4d7c5a9e8482c9a965f045678d05b4958faccf77abf8b409fe8456f
font_01_sfnt_off00012abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D6 10684 bytes
SHA-256: 5b7e31c596f2c4536c5f0f9e81c08b6f78e868d051305ec764488f670fa0b1f1

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