Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f198cea0a9a32fa…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 17:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a1c6fde2e64900e18160082cbb5a400 SHA-1: ff1f1d204db2e25b9da9f55599eee79853de4d62 SHA-256: 9f198cea0a9a32fa321d1ed61f0c3d75e14d35494a90ed915d14bcdac59c635b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://interno-kazan.ru/upload/files/wesidadawizezedisufotirub.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3feeed90c---punoxetutalipuxazazod.pdf
    • https://autotronics.vn/userfiles/file/79709714805.pdf
    • https://spotiverify.com/ci/userfiles/files/zesivizokogusovomexokexu.pdf
    • https://mimpi1pusat.com/contents/files/mawimes.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/sedukoxevasevebajike.pdf
    • http://gillsandgeckos.com/userfiles/file/fesivifowemabiwizaso.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/239027205.pdf
    • http://www.jokilaaksonratsastajat.fi/file/91045657172.pdf
    • http://cannamelis.com/userfiles/file/85676408025.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9d8154c201c0e8dbd8e43796706d0f4b/pobogoroselijuputipovak.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614465aa58d28---48904790358.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145675a10939---24652086623.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/32251103696.pdf
    • http://kieryk.pl/img/userfiles/file/sukanizobes.pdf
    • https://canionglobal.com/FCKeditor/file/59697517416.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/madutojozogosa.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/vodeko.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/57125963936.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/nosupodivolixavobabivibar.pdf
    • https://etest.vn/app/webroot/uploads/files/32816489470.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/pinanusevutivaponenere.pdf
    • https://baruipur.org/ckfinder/userfiles/files/46342484504.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sistema+operativo+android+para+smartphone
    • 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_off0000b052.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 16792 bytes
font_01_sfnt_off0000c864.bin
6a723716c1516aca678dfc867bd7a002e774c1cd6b35ae79c1a554b30e9de18a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 14892 bytes
font_02_sfnt_off0000ed5e.bin
fd38d5489ccff75ccc13f108bb78b629e3deaf971925bf2c31a1dd8a569b3de9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10752 bytes