Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5149bd595e67b4…

MALICIOUS

PDF

63.6 KB Created: 2021-05-15 20:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8d315c1b3c4f30a8ecd3db1e362f3d8 SHA-1: b0fbd78836b742ced005b0a37e41504f3facc771 SHA-256: ae5149bd595e67b4b5a9c882ddec1f571a503cfed8043c905fc2bba9b6c4e3ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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 https://laborke.ru/uplcv?utm_term=axios++file+node
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0547ea8---safixej.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb33e55ba---rozikizugapuvegopalor.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b57f585783bf98b9e4a15eaac253d2c9/zazefesasen.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oducrmgnqq0jrvir616monfl28/24830162833.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed1bf18060---90349491697.pdf
    • https://stillwaiting.org/userfiles/file/zumotopabuwipo.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/82265151344.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7bf9bb338ca310c95c1151485a497043/tulivogibuwez.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/csp5v9c3tsjkpfsm0u37tfrs93/fomisilanevofufixotozo.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a5f44f7ceabe6864e356efc1bd73d2/54469244688.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2260ddbb2667807606142b9bdc350cae/89165679399.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1d50f111---97147482870.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e631b66c21---23497914282.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c04a7c183---puneripasi.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085773e458d9---52272669020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba3.bin
836359f71731e926128d2602a18fdf1a75bf3961b7a04a4597c12a7b6957d9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 4360 bytes

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