Malicious PDF — malware analysis report

Static analysis result for SHA-256 31320527d6ca98b8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 15:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd55cd70ea00d1d66ec0a6ca345c21d8 SHA-1: 349ee8c348ef85bd2dc207424cde18525254e3ee SHA-256: 31320527d6ca98b8c81d902e4488aa17208d055281e175d307a90788b6db68be
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed for SEO manipulation or to host malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary intent is to trick users into providing sensitive recovery information. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://mtydizayn.com/userfiles/file/bofemukages.pdf In PDF document text
    • http://misosmile.com/upload/editor/files/rasazugazuzegekeg.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/85747543571.pdfIn PDF document text
    • http://contelex.it/userfiles/files/56326758125.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/343002624613a612e8bc31.pdfIn PDF document text
    • http://ebus.cn/up_file/file/misiv.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbee8f019---51274006711.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/71713077836.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/38784034270.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/11654579249.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/kilavimikomamepolozuxufik.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/gowusofaza.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432193ad324---kapufusamararulodupon.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/buwunibofanuxurafezofetuz.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/92416670399.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/46467487971.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5f0003a8---68860420483.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/nefew.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/49057554527.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109052329296551.pdfIn PDF document text
    • https://orrizon.ru/images/file/jeraluges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=react+native+debug+keystore+passwordPDF link annotation
    • 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_off0000afc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC7 14864 bytes
SHA-256: 2388913bad4004fcc62b9184212171a399c30a5ffd8724d2b8c0e3e5c386118f
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 11284 bytes
SHA-256: 1ee5c1fec633ee0bfe2eaae7ee848725afe81cc857f161ca6eaa2e73fc4b2547

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