Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cf6e0688daa5a5…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 23:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d25916ec10629149ca9e2a47f3c561ed SHA-1: c30473d3c2c7dc45ef2545fa765c13eee0bac57d SHA-256: 68cf6e0688daa5a5a2faf2c19a94f837ebb2a183d06f0759266b527390c4a009
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://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://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_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