Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae91402be7ba60c…

MALICIOUS

PDF

91.1 KB Created: 2021-09-08 08:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d8c8d61430f996f5476ebd7f252be7c SHA-1: 0610ffc852d612eadb77a9eb0a30322691e4cf67 SHA-256: fae91402be7ba60cf00fa9d30eb6c0a675df7ec9dbd5b789cc8a3db7fed50628
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adepotcustom.com/UploadFiles/file/20210509194735189.pdf In PDF document text
    • http://trendybiz.in/usersfiles/file/zuralajixoferefaletusi.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/96339154e805114b55358570f3c728e1/65791885256.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/vutomikoximopazila.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/40905284655.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/20049639808.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/306987e037d7e81dd1e0e02ecac7e78e/55174194225.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db8a5250482---towukogop.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fofogu.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/96804802866.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6bf41498f---vedexujidavogumalopu.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/89135269795.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/gabukemimirosuweji.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/98345058484.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083278943a8e---besotutopitatizegub.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/wumeditatinisagebifavo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf958a2df---12551759264.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/84677620242.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/32167644619.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/dofubifugerudife.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/29389257485.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zekejirareg.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22760249b9---vitenelekitimoxigeruwaj.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/regikugekuvubaxib.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/vekuxadurebenuxadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=define+utilitarianism+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_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 10640 bytes
SHA-256: 415090c88d4ff36444ec85db3acb5ae52f5ec24dcd91d8aa0e1dc40f11a2e43b
font_01_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 19628 bytes
SHA-256: 43936856ae6be4aba647ac7428cc7bb26033dcf931638b5637d65bd7ca565640