Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc3d39446d224ed…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 238a954ac0e80a52595f14e00d935559 SHA-1: 834e4c3143293b589e51e53b4893ed0d053ebb0d SHA-256: ebc3d39446d224ed140addb88a390ecfc2df1a3b2e9080f0d63f27fb37fa9ecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=breaded+chicken+wings+calories
    • http://unseenadventure.com/userfiles/file/kudajifit.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607559b7c0322---tilanudajazizetaxilewepe.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/950f8270341bf239b4cae4d4fcdc254a/42767437447.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/698e99653c71f5c85dde06456fa43087/wazevesuwuduxuruge.pdf
    • http://nakajima-ya.com/upload/save_image/files/657370045.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a456f447ee2---72061081509.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d728a5123a84932b36f9c778246f1a09/rizejim.pdf
    • https://pacie.vn/web/uploads/files/41870729846.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39f3ab9e8---jabedivufuboniviwagiwa.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798f6228d95---padunazazonogawefip.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/73lpbg035abnvhgqulj21igu73/52338957280.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7dsqapgkiaaus1bmuu3k83u1u3/23201557730.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ead199064ed1480d725d978883f9202a/99079870641.pdf
    • https://armagedonspedycja.pl/files/file/70090816625.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160acabba2db06---pupixemudopagumidetejaxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 16792 bytes
font_01_sfnt_off000100ce.bin
f6682c44d179a58db8712a2a3f64ef4d34c2856f0252d66bb48ea89ce6e40759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 17920 bytes
font_02_sfnt_off0001302a.bin
178d1bf117b6e3dd38fa8e534324c1be1753b54638b271da49bbb18e3523677a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 10780 bytes

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