Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ee293d81106cc2…

MALICIOUS

PDF

89.8 KB Created: 2021-08-10 09:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 709a886cf727c19c759616e1594ab4b9 SHA-1: 2c254b823af524c76541f30624eb50f47dfbf8eb SHA-256: f3ee293d81106cc249920dbd4d2789949d1012a4e9ad3481d771603962c10fee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to evade static analysis. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://decaiyun.com/upload/file/2106111020496725883e25o30zgx2m.pdf In PDF document text
    • https://privatecambodiatour.com/userfiles/file/zopanojolofuxixafivadise.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/95b0ec8e9ee0a31d2ed4cdfdd8b599c1/depirizov.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/wawemo.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/62436619073.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cc64047e30899d785a03aa52298fe58f/livikegalu.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/51488139973.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/revodoxotepisibewal.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd28c3f2ce---1793164050.pdfIn PDF document text
    • https://faceless.me/userfiles/files/begebovudixolago.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/10130844961.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7a87047ad08e2ca712d4c206889861da/19200410485.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/xaponisisasifu.pdfIn PDF document text
    • https://luminex.pl/upload/file/52633048722.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/96862616836.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/fujakun.pdfIn PDF document text
    • https://kildevangen.dk/files/fimopajutulidano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c38c6ae0b5---16071931127.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c3791d6cf6cb4a04eb00447fb887b220/tubifukogifuzixifako.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xidikatotazo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aa211ebc687---97150975346.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797bce3e28---6039586075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=situation+%C3%A9conomique+du+burkina+faso+pdfPDF 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_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 18356 bytes
SHA-256: b9c6b398db96d0a470afdea7c4eac2cfa0d9b50ad914790e8cf5a15157543287
font_02_sfnt_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 11440 bytes
SHA-256: 639e52c84e4fcc95e8b563b2269133d8668f54a841425141a4b5dfe465b1b628

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