Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ea66359ba143d5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 07:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1bea92d7e6a3c51f2a0a09b32a4d338a SHA-1: 999d37e7adb8bc2c819e6ca340d874f85ac8526b SHA-256: b6ea66359ba143d57ca342b33b5425cb01ab805b021378477210e15d7f3e6566
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with a high ML score. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware-hosting pages.

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 https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7b3f9ee550178e5809e87c1bb42f647c/16371467229.pdf In PDF document text
    • http://royalgoodviewresort.com/Uploads/file/lugakegaganofedupozibopi.pdfIn PDF document text
    • https://unitjaya.com/contents//files/zapovunoriza.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/bexirudosa.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/59869472350.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084445e2332b---xuwafagi.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/majokizerasutemi.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/11279791268.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/18650472662.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7dqv6s4frmnti3377i1n82p2g3/68867455789.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f76d6d1020d42402a55210f6c6c37134/70384117990.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d516f1e249310f61d719c1b1ca74a1d3/85084305591.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624aa9a994---62111337370.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/s05mm9p465b1lbpnkno7l294jb/zewojebapozali.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/vuzom.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/wovexuxibakejosetez.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/190820019969.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/40089837787.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dijudefelufikojunulo.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13935247971.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbd069251---jevowuli.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/bigisusowatomufumutona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pr%C3%A9cis+de+recherche+op%C3%A9rationnelle+robert+faure+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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 21108 bytes
SHA-256: 2a7571050eb9fbe0fc78210ea46a64a9bffe762b987a0a71ee1ecc9523b73874
font_02_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 11112 bytes
SHA-256: e8a0ab5bbe2608c7920835f27d5b70f211435580bc8e5bcc0f77795895f124c9