Malicious PDF — malware analysis report

Static analysis result for SHA-256 defeedb7aa130b25…

MALICIOUS

PDF

91.0 KB Created: 2021-07-06 11:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3773f7c6a8d7f0e102422da318723047 SHA-1: 5fbb19d27dd18f2eaad9f3de1c51303accf5ab9e SHA-256: defeedb7aa130b25624cb644023d74ca1232710ea7baaef39dfc889cf03324c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this document is intended to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://maxidmum.com/images/upload/fck/file/38471189918.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v658ikg4pr6gogdqkr1bn7ji7d/rakozadutozuxatitos.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/joduvi.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/ganoxodasadinuralakibon.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda15126c62---16448229773.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/bawisozajopanevar.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/u55m9s8t04tau8if0r2ertsbc5/61139598137.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/27679849682.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/kuwabemur.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/tifuwujarosu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca49b46a58---vuwoto.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/57a971620701de2e2c81e35844be2ef4/38766936414.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc27f69a1c---ledofirakinaxapi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6350e1d5491c2754bab9c2f4486962af/kajedapuzumisasero.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogufivubopaxiwomimudoji.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/gowotiguv.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9523d36d4---xefuxebawuwonavugukisejo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0c922c7baaea13f42172f488997328f8/roginotezugodibobuxam.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/38c8efdd0d882acc4adf5fd8e906102b/66617104756.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee6e6626a---79942762663.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/92a5175bdd026b42b45f6f7f23652c86/butixodagixu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098157813c87---35759179588.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/umtqjo858f9v2vkkqbp0ff500g/47566289133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=congruent+figures+have+the+samePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 17344 bytes
SHA-256: 3cd8a44c09ba6d1e089a195886621ba4e7349c0006b2a080c7914feb7b612f4e
font_02_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 10812 bytes
SHA-256: a08f56a166a9bdcce78418a443dd9773045e17a1142342e01eb81e6de96d2058
font_03_sfnt_off00014452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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