Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa5df489c8a50e5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 10:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 118966a136d6a2807f24d82bda628c5f SHA-1: 0253f50362b5f6e452339c23ab41d49ae467b7be SHA-256: eaa5df489c8a50e5f4b96d608ad600b54a9da1ef35dc5a2f7d876c939c29923e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no clear textual content to indicate its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hotel-la-licorne.fr/userfiles/file/75598073711.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a03b202da---87308996437.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/66097507554.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/buwajumawemekotudi.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/76394599653.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/eb0018e2d21dc2496b2c5051dba4ba43/potuwenuzetekadabov.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/40998543088.pdfIn PDF document text
    • http://contactconfiance.com/files/files/leraje.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107261006179033.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3abd71fad---76812617339.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/36455223684.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/metivodu.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2eafc8c2c2fa90ccef8c451a7e585e60/37825905324.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d745c945---5677168465.pdfIn PDF document text
    • http://schokofontaene.de/idata/44135592212.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/36307494177.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/todasonokapemu.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/loxaxomavibusunisukipolo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021530453233504.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/s9lkf0qm43p7nik5lkkrr979f0/bupikevamamobe.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703372ade12---25076828188.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/dozotuwik.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b5236fd6---libuwakebugarake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cummins+250+kva+generator+manual+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_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 11504 bytes
SHA-256: ba1e151d99b975435904bc41c3ac203840314a42cc0742b27063f7d636f64e84
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 18100 bytes
SHA-256: df0aa30e8603f8444136c959bebf8e9ba26be7e32167e76854744d450bad0073

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