Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9022cf86465140…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 21:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1180ca39083c6faaeaad064044c92b18 SHA-1: da4c80b252ce32d688fd87b3f13198a03e08ea6a SHA-256: ef9022cf864651406dcdbb4eb4f17e4261c42cf98b038263acf70918b28cfd0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, indicating a phishing or trojan distribution attempt. The primary function appears to be directing users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://acgroupenterprise.com/userfiles/file/16754392546.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae558107430---jokojofepozukumawiwamali.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebe52d67c---94839508348.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/natel.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48e392adab992894340abc9c698a5e8/73595523745.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079749d43d3e---64642891067.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9fef155b1d35b51826bab9a580b08ef4/korukozovapidux.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/52876286868.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/95973173461.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/a271d1f5bbfc108d389ed953622ea7b4/78691095844.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///suzefajafane.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e68f422da---rukimeluxerixag.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/fitosidogelogole.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/viwij.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd25ccc4ca---10019999852.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/diwiwevowalid.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e674e4eb9f---faronoluvalaxezejedosupaw.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bdc875e17---dasoriganovexem.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ca3t93rn0mn81t9hv9dejqnm2/71724962278.pdfIn PDF document text
    • http://clingac.es/d/files/1060007501.pdfIn PDF document text
    • http://daydala.com/userfiles/file/28131305471.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/13392896138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=barney+and+his+friendsPDF 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_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 18356 bytes
SHA-256: 74e5be8207ff677ae85d1b698bda40f9d0a5850ff68f09d3ce298ff83da6e39d
font_01_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 10352 bytes
SHA-256: 4de954daa8251906d863494da1e00522497dad2d0689ade30f4519f690c4bc5e

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