Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb327456f6cad1e7…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 05:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fb879af298ae74299b531fde17e0e3b SHA-1: e5f2be83e1abe3b4f4b1774af011d8b6ec9a301e SHA-256: fb327456f6cad1e738fc62f7893e668cbf84f1893d77ad2f46818580140e1c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608818e735fff---16514373693.pdf
    • http://hongshengfish.com/uploadfiles/20210609/210609102259555091gdfo5l025lp8.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094beb2befaf---96170156568.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4q2r43p8irel7o8vg3ou4q9tif/rizunitoxeg.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c03734a082619c632c10f98818edb058/38849354934.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/99839702403.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cd571edd---64090079717.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609702bfd197f---nuvuvoduxote.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be9660a5ebbf2c7a84ca3b5162fbcd00/8056447510.pdf
    • https://bcbc3399.com/upload/files/gufuk.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991868059f3---2152106645.pdf
    • https://terminal.hr/userfiles/file/jogaxebatinebel.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cac8c875---71568062029.pdf
    • http://altinay-law.com/images/file/sipirojozif.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999114c4aa6---zokojimavikeselo.pdf
    • http://architects-desk.com/uploadsfile/nufutepoluwidemitin.pdf
    • http://beateromer.com/bilder/file/62467634791.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f953b9e8b---bosuropojopulovarete.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ifeqkqjimh6p070qtjvddi2v9/zirafojomi.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dbe792d5f---59442384240.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb952cecdd6---82227429459.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7314b29d2ca51a8071ea96272ae10f0a/95702094188.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kdohb9f68hrdjcttuujh7p9fq8/90125469663.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081279bb2e1d---nipimatiriju.pdf
    • http://wooshin.kr/uploaded/file/203665654960b5488dc0f58.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=upper+chest+muscles+anatomy
    • 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_off0000e921.bin
1f48210e9fb68a9b73b592b7fdd0fbc45b6ce7b4d60228e0a1cee8d00401f999
pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16420 bytes
font_01_sfnt_off000113b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 16792 bytes
font_02_sfnt_off00012bcf.bin
e337f4e3f6c4b72b4da17f0f7f97e587fb069daa11763df6859ba1d3c537acfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 10768 bytes