Malicious PDF — malware analysis report

Static analysis result for SHA-256 5308b4a13ea2e98d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 23:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ad84305bd6cd306d76335c7473ff04b8 SHA-1: a2521fcfa8d09c5a945347523c654377cb8e26fc SHA-256: 5308b4a13ea2e98d3fe0ffce9a457023b3de28edeca2d449d3034ce7d1136548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm indicators suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://vinaconexmec.vn/uploads/news_file/60113025758.pdf In PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/26229641777.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/zepudomim.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/77370823478.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137288ed5ec6---85251855963.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/25437061880.pdfIn PDF document text
    • http://capital96.com/userfiles/file/78346883149.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/1807203337.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/fawakifugorixali.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161354e7290205---77172091557.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1426f8bdbf4408122b504e98de7bb74b/69612082857.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/66574101829.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/robubege.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/59155061060.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/zokodunuguzobirum.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/jopidoworiwa.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/78646190282.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/zatufedekixokufawup.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mefizuvutuvutaxopuwiw.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/napazikujisesi.pdfIn PDF document text
    • http://sofupingame.com/calisma2/files/uploads/vetafatefawukiwidepesufo.pdfIn PDF document text
    • http://grandfiltr.com/files/file/kamikerularekifojiba.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/44243450976.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/70486456259.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61331363659ED.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=increase+my+phone+volumePDF 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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 18400 bytes
SHA-256: 4144ea7e05cda75602cee0ac64c086b077c2d878b5c2cc4ddc6ebc4e3ceed303
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 10680 bytes
SHA-256: 5ca47702d0609d3ed17e899562d655ea50655e8c0e91294c165f0e75437c2e87

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