Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb46c4832c0c6746…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 18:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a7d1b8b0a33d6eadab2cc23183ed3c9 SHA-1: 5263cc5838b1d423a64f719ead80c83b460481f4 SHA-256: fb46c4832c0c674676d117049ad755b6cf3c43d8a993a8016472dc810fea692b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, many pointing to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fijiembajak.com/uploads/ck_uploads/files/85967452134.pdf In PDF document text
    • http://hotelsandmartin.cz/files/file/xoxulilodud.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/10566860798.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611402b5a9e19---37949509111.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/bbg1mh2o2pisd13nvgta4tvgm6/81621249729.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c5eb2a3a46da26a80ef9e36f7f8d7394/fubadubiwekinuboxawavane.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/lenojuzaze.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096aeca81167---64937536557.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607669b002a8a---waliwiporozuliluzazup.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/82376256865.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16241414333301.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021072809131670554.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/tegajotetodofumegaxasa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/11829260066.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/42063055824.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bb81782d---3455600348.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/luduranugukurebajixezut.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/880984046.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/l2jl6rr7ic4k6pcbgl9jdt2ef6/46824735380.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7nap96gb7ggk9u4a8d6kt9b9uj/84856608235.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/zoduk.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5fe43154ba60cb69cdc52c4b51a21749/mixanoropatutotenoji.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/javinimiselujuno.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/sikagulezi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee753be72a3---januwamamedijaxumunepifem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=springboard+algebra+2+answer+key+pdf+unit+5PDF 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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 11532 bytes
SHA-256: 659c0617b9306419c7f038c3b9a9dc34a8221f674b1e32909113021cdd4ee18f
font_02_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16220 bytes
SHA-256: 0c4b515cd3b7f985af0641b0a2c83523ea20441b1d011bce2e2f9a87b9b51d6c