Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5469706ac5d216…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 22:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc5998a4c278770c6b1d7eed716b4649 SHA-1: 2b4358c8f3cc29ca1f0bb4e9d79b950e7f208943 SHA-256: db5469706ac5d216ad6092f10117d80e7c36510416ec961386568d469af24316
176 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also strongly indicated maliciousness. The document's structure suggests it's designed to direct users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://solee56.com/ckfinder/userfiles/files/wedorojupezuka.pdf In PDF document text
    • http://tbeaindia.com/userfiles/file/relawavelike.pdfIn PDF document text
    • http://www.bash.cl/media/file/wakamajexu.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/72113252651.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/76f8e69554f38634d1b58ec7052b1c7d/jologebi.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/23833809525.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141e40d8e906---rusisolopowo.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/54747366451.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/82bac79dd2e68787f7882216c84382ef/bovarazodagumawilibukusiw.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/tarugixevepi.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/mitezujekovewoze.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/99209067920.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/87749843062.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/xujavegojolagisajukewiz.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/66339523813.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/97271253070.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eced72beac---jegixad.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/xopuzuzojomegule.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/finig.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zutasax.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/zekawenosus.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/43760057036.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/jodapamowobigakenododo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=run+android+on+a+pcPDF 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_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 18828 bytes
SHA-256: 40c38795c21a1ec02c71d4df196c0e756be4a6d4b7f3f3b965b11da1d6df94bb
font_02_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 10208 bytes
SHA-256: 67a5d9270b0b9e58ceda8c6d2b94fdb5ae8ac7e43ae60c17618c96e7ca4e3113

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