Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9537ae2afd8d56…

MALICIOUS

PDF

76.0 KB Created: 2021-08-23 01:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31d0fd4f235c9541776077fd91d9be73 SHA-1: 7949a5c9fd45f6b8d3e950ce9937b96a5bd98125 SHA-256: ed9537ae2afd8d5687adf8ba99e3c8ec39af7b4bebdd5dbd42e7c76056f4b5ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce63d3841f---waxuvexikejoxowobudit.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e8326b5e4---vujupixaruburam.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/596c4782101b5082d14bac46e97c92d8/vevejizuvepugesokigakoti.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc8a23dc6---bofapededivizuxaxew.pdf
    • http://www.dereformasenalicante.com/archivos/files/jadija.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8410d9a56---79757008079.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0145hra5i7c2egdgiifjoj6136/27635121070.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/simatumave.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ukbddh9ath4par22h30u3f8vh1/viwizazebinomopa.pdf
    • http://accapierre.it/userfiles/files/bejawom.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3f1a4bf054f9054f8f85b8f4dce01925/56393422359.pdf
    • http://avanti.pl/userfiles/file/wubirawavojevubuvum.pdf
    • https://eliteplacementagency.com/uploads/files/bavakowupakezemi.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/h651pqnvd9bnpjet4vtc6evoa2/resimikinivixiro.pdf
    • https://telenovella-bg.com/files/4029398070.pdf
    • http://afghansolar.com/userfiles/file/7059656417.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-7-30/20210730010950679553.pdf
    • https://99shayari.in/userfiles/files/gebifiveni.pdf
    • http://malbreil.com/userfiles/file/kuwirevinezuxidam.pdf
    • http://olech-rzeszow.pl/userfiles/file/gafuwusanamozubilexi.pdf
    • http://mkngsp.ru/upload/files/garami.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6a933978---31119555075.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=d%C3%BCzg%C3%BCn+%C3%A7embersel+hareket+soru+%C3%A7%C3%B6z%C3%BCm%C3%BC
    • 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_off0000c0e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E4 16792 bytes
font_01_sfnt_off0000d8fb.bin
03aabf3e56e375fd5c63df8bb8d35ebb92d466e47490fcc12df5825216ffdb0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 11460 bytes
font_02_sfnt_off0000f32a.bin
ea65af5d72e478ebd367723acfed42a431fbafde5d7b9d8f7be46c5713be7cff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 18192 bytes