Malicious PDF — malware analysis report

Static analysis result for SHA-256 92aa765b67652220…

MALICIOUS

PDF

84.6 KB Created: 2021-08-19 13:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3997a6122bf8ff47be2bf4264ef74117 SHA-1: e9c3f767ac092643becb1218065022a0bbbd3923 SHA-256: 92aa765b67652220dced8f73cbbed152e2c2d09d72c55cf78127250e241acafe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b93252a6---5575426612.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611e073335ebd---16084208290.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/77393076053.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/6e3c447362477334e76c98aab93f998d/41499189462.pdf
    • http://gildiamasterov.ru/userfiles/file/6254604031.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4a78748330970a2ad7421bcac9c56731/levesumijide.pdf
    • http://ahrestygz.com/userfiles/files/20210702_031311.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9087a493---xogekisojunepi.pdf
    • https://residenciasanamaro.es/userfiles/files/marusawatifoverek.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3eb091d22---fafexazidulavibabamesu.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1950bce287---86316943461.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/zafilix.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ebdb123f505716ef01255744b6e8b45b/20708322565.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ieneevl9sitjn2tvduq49ao1j7/34600890331.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/p0dqg8ii0vvr7o129lb7iphn1t/texazatux.pdf
    • https://hijaulumut.com/contents//files/kutovumibaka.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c566f93ded2---migikiwidegefufitep.pdf
    • http://etnorom.hu/pictures/38415981617.pdf
    • http://stellamaris.cz/userfiles/15372385593.pdf
    • http://lab4050.com/upload/editor/file/wizejosajib.pdf
    • https://profitaler.com/UserFiles/file/taxawurumikusij.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2df27745---47480918899.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b33cca6d---sowamiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=walter+riso+amar+o+depender+descargar
    • 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_off0000e2f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
font_01_sfnt_off0000fb09.bin
ae92e03a6852f64a8152b2e66d4c8a6aa7df2dc80762269f3be30da5f33c8eab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10848 bytes
font_02_sfnt_off000113d7.bin
b41438949ccb542196dea721e34531a4dad41d829673fb7633302d40b5872964
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 18260 bytes