Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac97f886c786351d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 03:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 049921fa0c3e88ef07c405373ffd5d14 SHA-1: 9802459350a46f34a4bb7a58bde4ddd50c2b8eb1 SHA-256: ac97f886c786351d4a3f20bd1575076e7fb7fe439b4fb64481708d690d9977b0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://hasadtemizlik.com/upload/file/ninufazazeruxas.pdf In PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fixewagorewalufonivok.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/78634217463.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051904570764.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/bijatedamevuzul.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/75748920853.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096517bd3104---95947851594.pdfIn PDF document text
    • http://zae.me/datafiles/file/36345063036.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/jemiliwusapogevapeweme.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b04290ce2ab---48816545848.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4d7482ad9---12634376665.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/46107113941.pdfIn PDF document text
    • https://securitydm.com/slicice/file/vuvelo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0cbsdnt4kj2anvs2pt8cspslq9/xegemobewekinasuvibuno.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/juves.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161161671c5262---kavalenusasigefipo.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/sugunuxozovoromuzew.pdfIn PDF document text
    • http://fotossc.pl/_files/file/limotugevimizavoto.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/92848606129.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/kitowew.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/27526704696.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/45201684876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=stay+at+the+queen+maryPDF 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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 16556 bytes
SHA-256: d9b07b81bdd54b885361a6fabbd80602c24d2d7ac5a8c05ea37527de71c79cd0
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 10380 bytes
SHA-256: 0aef1c0fafe621e02762c4c63ff784a02646d7e38d1e80a30b00abe032db14c0
font_02_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.