Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0440efea2dd848…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 08:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3492df3ccba0f77923e7d15e1452c9e SHA-1: f9cc9adfd24ecffa8f7a2e69cd2b44c886d15a2c SHA-256: aa0440efea2dd8487a8b4f878a06347db3b98160f741bc898b5dada277c36a60
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa232141283---49120775252.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/2529354305.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2b05b9a23f11c67a3e8b214be6e35615/jaxer.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d26950fae2f4aeb99e79498332f1d9c4/baforidosopiwewovisiratoz.pdf
    • https://briljant-maleri.se/UserFiles/files/3361299600.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a48eff41e0e---namilegejaxini.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b308c77c72e15c0ea4abec4a285d5f23/81994009479.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21724b0eb---59059093911.pdf
    • https://hoakhanh.vn/uploads/image/files/zalijota.pdf
    • https://netshopnepal.com/userfiles/file/25251831172.pdf
    • https://africanresearchcenter.com/userfiles/file/54038714046.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7a44b4e8---39188912569.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/465d584dce78f63a1acd4330d0f7c404/22520231581.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722bb710f5d---belanowi.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ec09c12c---nunamixifag.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d6250014---fogumonawiwire.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc0332809---basukunajam.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/f6ol1pt70oncnmfclfi8miace2/85825547683.pdf
    • http://ibtaker.ps/userfiles/file/18017971176.pdf
    • http://araonline.hu/uploads/file/libaxepojijumepeforexijep.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3tlm7s33gsikhvvjbpq9nseqf/68164893407.pdf
    • http://kipia-nn.ru/userfiles/file/96670786643.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5456d057592947a87354cc4bf0cfbcdc/kopuj.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ce1adfe6---94061616872.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/podoxudipalegademebizog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=realized+compound+yield+to+maturity
    • 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_off000100a2.bin
82511eb78e9c747b8530665d7cf10f7d2170544b866513c140d90f0f3e4f96e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10828 bytes
font_01_sfnt_off00011993.bin
08d1e53118f9c8bf9915ec4c0c1f2315acdaca35877546ca96d7ae621a540771
pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 17680 bytes
font_02_sfnt_off0001483f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 16792 bytes