Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d75554b92636bed…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 12:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 581f2871fbe84f1ae59a6551beee68f0 SHA-1: 002da73ac3b8b6648f041381ad1f45ccc15540c1 SHA-256: 2d75554b92636bed220db59046b17711afd2894ada1cf7a4b57d2ac7d2a1a78d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the 'Phishing.Trojan' detection strongly indicate an intent to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e037afae---73747427589.pdf In PDF document text
    • http://lyjclinic.com/ckupload/files/wogisujamonavabiluru.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/gumoteragutawoxag.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5e3b4t7rq3djp91cm2oghidcs7/13108910569.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102bf485784c---fokazol.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/qu6atd8o4gndtaou4o2qcdhsuf/livolexazuzanujug.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/32065938438.pdfIn PDF document text
    • http://ducnhua.com/upload/files/15482874665.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/zesaruw.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/93252595298.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/64030996974.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/88475331273.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/tutugepiwite.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fujufabem.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/3084611081.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/kunopoporuturejopobatura.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xokujowupufavivaki.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3310656c4---dikozomijaravizes.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/79932279673.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/namefejemufev.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/luvigosixebividiziro.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/723ac57cd72eea929ec9e4a0b587f912/lilasam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=marine+biodiversity+hotspots+and+conservation+priorities+for+tropical+reefs+pdfPDF 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 11032 bytes
SHA-256: 0418029ae7dcb11a0f3fe7680c7a930f4e89ffb81d83752a67e493c5a4fe5359
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 18744 bytes
SHA-256: 959093c077c5d91a660d48f9fbdef1f79a24a8ba888a395fc3edf3251029712c
font_02_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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