Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be418e03c5286cd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 09:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a7d0db5e934d8d7928fe6a27ef29ed2 SHA-1: c91b923b9788dc089161aeb2a2416aeb5bf2acaf SHA-256: 4be418e03c5286cd28028386ea82408d848b5ddc082d98d84919bf5d6d9d2f72
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress upload directories and other unknown domains. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4377

Heuristics 5

  • 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
  • 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://saothienemb.com/uploads/images/files/43530066472.pdf In PDF document text
    • http://tavaszitura.eu/userfiles/files/wetixotutegiw.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/14450952211.pdfIn PDF document text
    • https://ms01bet.net/contents/files/zopomapozi.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xuvunuvujomalajumufor.pdfIn PDF document text
    • https://medtek.vn/storage/file/bepekezowevep.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21068af46---37474584238.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/ganabikokoturudujix.pdfIn PDF document text
    • http://nprofit.hk/userfiles/61736370534.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/tijodevanowofuxow.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc56f09f7---bijusegadefudejum.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e239de349---xatirut.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4c07c716f---95522534450.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qdhmiju4sglcsk39udi6vk9co0/94635225415.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/gimasekidej.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210731195930_p16nao.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/91825728776.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/14305172433.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/14573705862.pdfIn PDF document text
    • http://18554080.com/userfiles/file/zenawoziloneniziluvusomox.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc32009fc2---38223479871.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/lined.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8nlmfciae1p7vtpo5o93p97p3d/16910042084.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5h2i3om5ccl0lc7nakhefti62l/43659347836.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9nfsk3m2q439kkrg0ss0omp775/debiwijimod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reolink+argus+pt+manual+pdfPDF link annotation
    • 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_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 17060 bytes
SHA-256: b9d311b982171d72ee6f7a0e8a25ef60a83a95d70cb81ec4d686c0a2d2a0fc46
font_01_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 11076 bytes
SHA-256: f27fe51e039aa0ef63a63c821d1c8dcbb1fe6e944a5f886b13e036fc03c39001
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1