Malicious PDF — malware analysis report

Static analysis result for SHA-256 02833830fad9de10…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 15:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b821b0bda3566dc56ac2d28b726c4e7 SHA-1: daa6f8e6ac1b8671550bb29eab28e6b6d46fe386 SHA-256: 02833830fad9de10c293dde590030e1da9da6fab459df088a0c4abeb524cb4d1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. ClamAV and ML classifiers have also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://buchtel1967.com/clients/26382/File/63152058933.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/86372243561.pdf
    • http://messtores.ca/fck_user_files/file/dogawopagenapagezitimet.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/omocdvj5ui51gmvo4eppitdtpo/jumujekowisupekisux.pdf
    • http://mebco.ru/images/file/67231612178.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vm7umsfgckmh86q5jj4jgh3870/gepagaturonapitaga.pdf
    • http://backupcenters.com/userfiles/file/femevopit.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0gl904risthm8ek9mbcoom03su/laketolepotapogenak.pdf
    • https://charlesstreetvideo.com/userfiles/file/zafinuv.pdf
    • http://saigondome.com/uploads/userfiles/file/49206180239.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ded1ba42---lumomusutesesuxufuvituwu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f1cfda7f4---salefisasesapikabez.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e418c7c29---navazewunapat.pdf
    • http://fpole.ru/sadm_files/79863988283.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4463da61f---bojozizadapekoj.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079958e79f76---25272640219.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161201c4dbcfe8---19693328409.pdf
    • https://ljlconst.com/admin/images/file/91663408778.pdf
    • http://gruppocreta.com/userfiles/files/39215519011.pdf
    • http://zzquansu.cn/d/files/88732555073.pdf
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/kidinelajiladuxep.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c680bd687a5---91641025804.pdf
    • http://aal.tw/uploads/htmlupload/files/bufufujimavizegomalat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mimetismo+batesiano+y+mulleriano+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83e.bin
2d0aa0d96cf3c94a1e72eae7d03659b50d7a8412f798c8318b619f469a2fdf0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 11004 bytes
font_01_sfnt_off0000e19e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 16792 bytes
font_02_sfnt_off0000f9b0.bin
d4b1cb5ff6cb114f07009c45fb5ba971a9dcb85386667116dcbe5bd4e4bb9125
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 17224 bytes