Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa361d755de8b4d4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 02:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 852968460cbbd4f2b9200d42e21d6cba SHA-1: 885e41320e978e09d828205331d0436f8944da68 SHA-256: aa361d755de8b4d4259d4bf0295445468b2d5cf7d2792f82b644040ce34136ea
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=delete+temp+internet+files PDF link annotation
    • http://talk200.com/admin/admin/uploadfiles/file/xogawekarowijatarimo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dd81831cbef0470d3524af47607d7143/88224233610.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/7043266715.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/78131965895.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/nujokaxul.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/powojofimapeguw.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/90352455675.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/fozividowifozipefomorema.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/jepepivufajuti.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/19736768437.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/pazemutuj.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/32696805387.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zunisudilanolejum.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/sanenagefuxunovurewiv.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092108324549.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/14458952155.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/10101607198.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/lidomururuxepimivow.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/jatimajigerovega.pdfIn PDF document text
    • https://triosms.com/userfiles/file/50112104579.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f94b03a752---jagonajefukifodadalezaka.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/newulakelejikupezodenixip.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614d15636684a---37838722494.pdfIn PDF document text
    • 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_off0000ae5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 15216 bytes
SHA-256: 8cc7fab767b4c8faf2f8da285ef5fc0aa973dca1dfedab503b87aa44ac069d55
font_02_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 10236 bytes
SHA-256: b3de7bd8a41d1fb3b18efddf0f2af9dfb04f00eacffddc4058d2fc47afde7010

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