Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a48215297fb056…

MALICIOUS

PDF

106.4 KB Created: 2021-08-24 22:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 69954b1581cd5c823cb8b54f32870dca SHA-1: efdd7b6b0fa526320fa916a596a7c86e0c754d1e SHA-256: b8a48215297fb056e2886acf2337846f000488f013bb329d6bbea543374eee22
132 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan. The embedded JavaScript is the primary mechanism for exploitation, leading to potential client execution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3728

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.
  • 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
  • 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://medvor.ru/uplcv?utm_term=have+a+good PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cecf7818d85---56423420653.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/xifokovig.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/84830848038.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/90739913733.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/98829635900.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/78240509146.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/4503879167.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff369957a---jabubopizogidazuja.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebeeb61071---duzadanesufutomalesuxijow.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7a6667f641cbfb514e4ebcb097c47a7d/50142181866.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085faae548ed---81349820367.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/bujimuwuna.pdfIn PDF document text
    • http://praguetransfer.com/files/file/14509977608.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/pirojobezodunol.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/fumuge.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/76315506149.pdfIn PDF document text
    • https://cartolmania.it/file/gokanuvuzas.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdad1dc357---vufigadodefoge.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/68497035341.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/32918936765.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/36899238213.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/45424010953.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc40532ded---14287291960.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/41074120635.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160921aa74f3a2---87852273017.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001514c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514C 20908 bytes
SHA-256: 1b0976f1c545fa816b132b3b598662bebef9e46b89542c882534b771e149234a
font_01_sfnt_off000185a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1