Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec546a2fbc9a090…

MALICIOUS

PDF

207.9 KB Created: 2021-06-26 00:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 74ca04e383bd418de9c14c746f847cd4 SHA-1: 8cef157a8ae3d5fac2ff170e8d3ab05f9206bc25 SHA-256: 3ec546a2fbc9a090ed462776523749ba8cc3c641fc24e4cdfb1c0f112682bdb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised CMS uploads, suggesting an attempt to host and distribute further malicious documents. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign designed to lead users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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.
  • 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://fotofolliasanlazzaro.it/userfiles/files/53848924341.pdf In PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/83809024917.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bijefugipejuxide.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e390f4bcb3435d9afdc5eda39a7c479/tuvinogezeturu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/igca1o9m554affc3se2p95p45k/87185804436.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b0d2e553f---wagobodikefakenukovif.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba607833ba---nilokomejo.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/86404506789.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wolilo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/64cee65ee671fa8b794cc66e98b67ada/66066906677.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160839abe4d4a5---63063004076.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39028953547.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d853ba3bdf24844ed7a911b9fc959861/ketakogakugojutuduget.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bfd91b9491ee6621d0cfd1a249e5ee5f/pafikup.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d23a18942c5---83730829580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=confucius+analects+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C0 113876 bytes
SHA-256: 10518f2f650f00cb33f52534010a3786f1e69f2dc1c583b97558ce87883f5236
font_02_sfnt_off0002ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC64 16916 bytes
SHA-256: d15286db19ff0a1fdf451dc9e566f7c1eda7e4561b5b08f3824ae1a60981dcfe
font_03_sfnt_off0003187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3187B 10644 bytes
SHA-256: 7337b1c8c8e8d6a27cdca349d91474f529c7fc8807416cb63f20e566e7de58f6

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