Malicious PDF — malware analysis report

Static analysis result for SHA-256 9958139cefb11498…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 16:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e67596172be00ecb7da5276725ebf730 SHA-1: a936ef7a7240b5480cacdf6fc736a296cdb42a23 SHA-256: 9958139cefb11498f5e8cbe22c1a028a0874e4459955354200a9b08522fb304b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded URLs and the PDF structure suggest an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gptools.net/userfiles/file/79275120942.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5fbcff04---vibetogafikiwukejadomu.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/66465609860.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302aaec70ea---zotuminebamavinezu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/97880884251.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/67737736173.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/luvuwosega.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109081447025950.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910150038.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/16988050975.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/31459418080.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e5d1536ef378fd61136d9e0ad3fe7587/91898673623.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93b96ba3a---25884767114.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/pofulozakelavu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c80d987a91776e8b8a212dec2ce48839/fumafadodudaxotiloluruzu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53a639990---sopemugarunezomorilito.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/21793501376.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wutuzufilis.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/bobivafojimozizugineto.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/733003780.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/kezalisirereguri.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/sogem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=2k18+apk+and+obb+downloadPDF 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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 10396 bytes
SHA-256: 9a3b1664f67815b1af82da41be3bd6d93d7cc2e689ba1816f25f01f6cf3f421f
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 18176 bytes
SHA-256: 4bbdcef6c09d279fd1ff33a74f175cf9d6320eb8774d08a9197c3fba540d33ab
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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