Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f32b58cd33ed6c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 15:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ebe610da20a5d66577d670151f08198a SHA-1: bfed9a111d0c20b130924dcb994e27e6d73a3635 SHA-256: a9f32b58cd33ed6cb05860ac4ba1fdca097e53e1520ae2dfe128170d7c2dd736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other unknown domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb1133150---gawizewilanokejupavagoder.pdf In PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210911_9975C3177C0875B6.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109140643506594.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/jarokokogopabagufub.pdfIn PDF document text
    • https://ms1oke.com/contents/files/takinozi.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/sisaxazozaw.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/11773125803.pdfIn PDF document text
    • http://aurora-c.jp/files/files/77170892515.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/lajetid.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b592f70563---21646524608.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/nomelusalimurugajatibozo.pdfIn PDF document text
    • http://learningkey.org/userfiles/6637849357.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7rf56g5gmjln0ok41gbqnkg3dc/44538881243.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141804cbef2a---ripovumupesaragokame.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/firupokinojalatimelanuj.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/50001991758.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/9389083001.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/11981d732303390afd2bc7fe2d5ba0b5/30103744878.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/20093913485.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/nazarovafiwuremanizopakik.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kijatorik.pdfIn PDF document text
    • https://revive.fashion/upload/files/66117532958.pdfIn PDF document text
    • http://drironcat.com/images/file/67613102760.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/18597507131.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c5e335f0---22389788126.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rituvonaganofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=connecting+pc+to+android+phonePDF 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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 10608 bytes
SHA-256: 791f888a26690b9dde6ea41763000bffdcd35ba42a1f4d6fd176904dffb88d35
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 17656 bytes
SHA-256: 666bd12d5642fcea01bb1a855b081384f22955aa49676616fe02d6c9a70634cb