Malicious PDF — malware analysis report

Static analysis result for SHA-256 63090a34796d54ad…

MALICIOUS

PDF

91.6 KB Created: 2021-06-30 15:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42b1b833c53857b33c8894ee791b0665 SHA-1: b4808c877f5a5957d61546f78ce5f98618a2cb27 SHA-256: 63090a34796d54ad93d7219d96006be46903638b393e9f98e746497b1f14457f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://chcial.ru/uplcv?utm_term=manual+blister+machine
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gopera.pdf
    • http://learnersdigest.org/userfiles/file/gelotijuzelur.pdf
    • http://hytechplus.com/userfiles/file/45783045734.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/63828801864.pdf
    • http://dolphindp.com/kor/FileData/ckfinder/files/20210618_D1AB5C3957B9782C.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/55c957a676c5ad4d46a7f26b378b258f/soxonimefuvorub.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8198c815---nufibal.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/79112719141.pdf
    • https://lee-trading.tw/archive/upload/files/55586147990.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081dada31dab---8643663334.pdf
    • http://scmsalliance.com/clients/864514/File/gafoti.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096631c515f5---58210943433.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tts419fq6smu3nubp40e81huo6/xonelunizuvetob.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9faefb0ae4---76231054364.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d19d8c4c5---74301563416.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/507abc0a9e8399da00a6691f7766239a/pubupazarepegesewub.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ptpk0d75fjfedsppiub4qf58e0/xosajorom.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080579fbf5dc---92406051733.pdf
    • https://villanakarin.com/userfiles/files/29636525819.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/raginu.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/294eee84033c882f44648e6d638e9896/51691092137.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ab7e3f4f---terovovobezivu.pdf
    • http://jyotiacademicpress.org/uploads/file/dosipab.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06fee4432d---bawogamuvezorap.pdf
    • http://immobilieninvestors.de/userfiles/file/94878693187.pdf
    • http://capitaloffice.pl/fotki/file/vigisimax.pdf
    • http://homestationrealty.com/userfiles/files/vitojapota.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_off00010469.bin
768603dfeb33da2289fedcb00baeef61a2a52fc8190f63ffc9bf81682df68916
pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 17368 bytes
font_01_sfnt_off000130de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130DE 16792 bytes
font_02_sfnt_off000148f5.bin
a2241189c63450d7072459c1b8573f06924bc1b5590f1740c055290a3bc00b52
pdf-font-stream PDF embedded font (sfnt) at offset 0x148F5 10608 bytes