Malicious PDF — malware analysis report

Static analysis result for SHA-256 447b4c885b029781…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 02:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae102345574d814285c80f2c425cf96e SHA-1: e66f5994347d58204442e7898c72bce573210d3c SHA-256: 447b4c885b029781ccc2092338aead6023ae45004f42f7094d1e856a439d7508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=pokemon+dark+rising+4 PDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/eb5b6bf788df630e04f010e92cbe1df4/nezewizukapupeliwoxebezi.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/98469403028.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jedudaduju.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/nujelupawatunigukuwarezuk.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jemujimebolob.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210918172601.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejap.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/24644272216.pdfIn PDF document text
    • http://prestopc.it/upload/file/namer.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/rosezidapati.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/70009885683.pdfIn PDF document text
    • http://leruichem.com/upload/files/84350491281.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/9083317110.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-12/20210912122851815674.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/55342984575.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/fupesesusewebixurolofel.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161359cb3ab3f5---gomasuliwipet.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bhq23hrkb1h8orpjbmf58h8at0/romitogoxunoja.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614114acb686a---40238911916.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/15696525370.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/24488869042.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/vojawalati.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161375611b720d---40424565971.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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 17100 bytes
SHA-256: 57b85ea951de96a3a01f7cbb451f8f581c803249e9f772cdefca4fe179b0be97
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10616 bytes
SHA-256: b4489089657c7eb53be62f0caa108c39b1d32ea38dd954ee0d1c97982ce51f97

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