Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad8636ea4433894…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 03:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 552966c0c4e521303b2bec010b428404 SHA-1: 6d8b4f78a53e58800c31b33d68aba336e1c87d54 SHA-256: 8ad8636ea4433894a6ad36a0cb88aaad678467cb8b6d53852b2377e9500dd615
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=google+material+design+color PDF link annotation
    • https://calson.garment-pro.com/ckfinder/userfiles/files/46520163323.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/pazevefiwabaxedapolatepi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436d536e8fe---60045883755.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/37723752690.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/balomudemimekajurud.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/40311800985.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/45493850110.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/3194203797.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3cc3f2e0139447249d8419d187164b60/bodeludujive.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/10678378220.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/wiloxewi.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/78911858463.pdfIn PDF document text
    • http://www.bash.cl/media/file/14545164876.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/87929570931.pdfIn PDF document text
    • http://midel.me/userfiles/file/78997369707.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/xujoriwitifimovarademuf.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/wotetis.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lufapewemugawibakiselatuw.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/74325050819.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9b209c6c02b3b195d3c3d7a6da974fb9/78958291391.pdfIn PDF document text
    • https://arerp.kr/data/file///jatis.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/vavuruzizimalukuwebovaven.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/i06sj7flifjihb384qovnirnqo/83970119383.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/penurapemuxadumosuxez.pdfIn PDF document text
    • 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 20480 bytes
SHA-256: 140552408410b8643cf68fab025652a3ed418aafd3cbab25bada7a5304487670
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 10752 bytes
SHA-256: 6fe92dbc9099fd9b64358a68ae13b3f7453d54cfea5f480f152a7041b4d94226

Open this report in the interactive analyzer, or submit your own file for analysis.