Malicious PDF — malware analysis report

Static analysis result for SHA-256 af26c7c5d95f6c4a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 12:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce348212af787cf4886103a28987e1c3 SHA-1: cb95f1f12ee8b1ccff58216eb61224299802aba4 SHA-256: af26c7c5d95f6c4ad7a986ceb339d1221c9d6b1e28ca7fe7f669576245200d61
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the nature of the hosting suggest an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://suthuytinh.com/app/webroot/uploads/files/vaxezi.pdf In PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/88419985743.pdfIn PDF document text
    • http://llux.vn/uploads/files/kafepuwoj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8b463dd4---32781985009.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/wokidomup.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/11137394294.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/gujimoborotufoxumov.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/93043697483.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ee52821b1158f6cea3807ce251fa5ee2/netokepufotamevukav.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4ca1342d---17098116222.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608273df36951---71743656026.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b2fcd286e---sakixuf.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f47424e5---fezazimevibadigejivep.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/56790266539.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9544f96c4041fb330c7d278d1720095d/6531045797.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/82127894021.pdfIn PDF document text
    • http://exima.kr/userData/board/file/renikuso.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d936ef9f---20451056704.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/lilazijekuba.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/21091247527.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/jigekupefovixudowafirow.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/sozetuxaxanaxen.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/gifodaz.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/46613914648.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/7511283133.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/r3trqeb7blm4hrcg0hsiccspq5/sorogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mathematics+study+guide+grade+8+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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 11212 bytes
SHA-256: 6f2f175cc4f62bb3f5f1ca967fa3bf2d02c79fc77dcef5a731d0d276209671f1
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 17640 bytes
SHA-256: 9434093f366078fb80ee92b1ddc455df55673d8e4c70546f6e59be8f7beae142

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