Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e7c142b3d7fe11…

MALICIOUS

PDF

94.1 KB Created: 2021-09-15 21:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82fd1a0087b39127af6b509a1e78cb4b SHA-1: 6e71fdc65fa5d1afad6b72d01020c4e04a4ce24a SHA-256: f5e7c142b3d7fe117137a7794ff8ffda269f2fbfe83c0ddb721c62686ebba9bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=fortnite+battle+royale+skin+generator PDF link annotation
    • http://stonestudio.pl/files/upload/file/40946417404.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614179b363ee9---tenibujuze.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/dowipofovemu.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109050451234077.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/vojusiviro.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/88745754799.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/mivojotevefelaluke.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/sofijezenerulujebuluzos.pdfIn PDF document text
    • https://viceda.com/userfiles/file/35796645445.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lowimewumazedibopuj.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7bpreiofl72g32eq2bp6koava7/18369112850.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/mosekavovawerupapovojurek.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/weruk.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/45122124267.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/df231be270f4ebb9044af47b0b1dff2f/37734838532.pdfIn PDF document text
    • http://eksternest.be/images/file/riduzawumazorekawu.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/76544776763.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d38224c88---wudezesomep.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/73923292306.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/70451147595.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55792481661.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/31614129539.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jelunefelakimemu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/98977401728.pdfIn PDF document text
    • 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_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 22168 bytes
SHA-256: 616433cb91aebb22fc6eacabee54f31af6323801d7e3ab8212cdf5c91b74710c
font_01_sfnt_off00013a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15229 10608 bytes
SHA-256: d87a019c7b4808a1d35b0aa290350aee02f89f42effffe04a17674ad7e06b607

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