Malicious PDF — malware analysis report

Static analysis result for SHA-256 a239573145a0a37f…

MALICIOUS

PDF

79.3 KB Created: 2021-08-21 23:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d88aa6207548e1ad004fe61963dff0ff SHA-1: ec0b7e7867a71e93e53fc05f3875a6de536c3a30 SHA-256: a239573145a0a37f6e8d72368e6be5c1a0f0001e3611c365172928dbeb927714
124 Risk Score

Malware Insights

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

This PDF document contains a link farm, directing users to multiple external websites. Several of these links point to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure to download further payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4216

Heuristics 5

  • 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
  • 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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34cb66cc64---paxulonewe.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fef2e1e00---pilogunigusasuvi.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/pivupetuzixageg.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/5043974457.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/vutadenogasudetezefajim.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/10ee9d8921ba12ee689fe71feea6f014/nifomokik.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/38732103705.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/14453043272.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/nibegomineg.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/16680488805.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a6b86415---24328391070.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/94943224464.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/penovopagevej.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/pitomukopupoje.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/72305668756.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/udtlg56jmcutjmsddlt5sbau0s/65343446677.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/57185308158.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/umqd6ibsn68f6fse8i0es1cfta/9589337495.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/28121126492.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q152kb1qp6d7jvo8javutqg4h0/mekud.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3krrj6btojh1nkgjrsdqamdst7/xixisos.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984a14a6941---gutomoboxepulelagog.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/90892061707.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd2c24487---80324015078.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0d614bb6727b24d989ede02efca9f184/2729151135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bleach+vs+naruto+mugen+3+3+apkpurePDF link annotation
    • 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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 11212 bytes
SHA-256: d7361fb6def5a41e0eb3681d1ff7c5905acff17879d0b3ed7626b4681378b7dc
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 27956 bytes
SHA-256: 9314a50ceb42ece38e92b78056cc932272119c203f451f8c5862460c45d6fc6f
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1