Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e454f72ee423055…

MALICIOUS

PDF

84.4 KB Created: 2021-08-18 06:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a038eaae1ae58e2300fc1991fd52b306 SHA-1: 231b68f57d7f8d1dfa35742da47e53588886c8dc SHA-256: 6e454f72ee423055055633e4020daa2f2792c9cc37a2e62c49792d4b1f11445a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics points towards an attempt to lead users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/51103322607.pdf In PDF document text
    • https://led7.ru/file/46903277035.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/anp86kirgc274sn98ep5og2sl2/25327789968.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nds52mdjsjfetdn0l6g7798hu1/bogubeduduguxamow.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/894cd6cba0179b8fb25c25c1abc6883e/81895086077.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/66492157791.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/dcbe53e218eb4054732e8dedf768d696/2710641926.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/84322788424.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/3437510366.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/10499474934.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vakavegagoran.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9f1724b24257a1b3764db8c9f9bcddc7/nisilibozelesejazevag.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/saloru.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/temonewilanabegigaxikig.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1abed2e476901fba59f5aa2dd033c881/72561192306.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/j8ebcqncpq83c0bq3ufo9rigmu/vegiwemifomolusuxidet.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/91778782506b91c6bda8dac3dc63a8cc/74687256358.pdfIn PDF document text
    • http://vswet.ru/f/88996183400.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e29e68d71---85344832319.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/56338112070.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/54593199554.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbe49d404---jovarapojomiximilifoveled.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/2949577188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=online+marksheet+verification+haryana+boardPDF 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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 17136 bytes
SHA-256: 9f2efe8d89b313371922f667c31e69c3b864b15df1c31110b0453f3be73c37df
font_01_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12921 11176 bytes
SHA-256: 0a740f8f18d9a6bc92efc1dfe51db53ab916d5cf8b3252cd282b07344f1a3cfd