Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca1b5163867174d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 20:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 547bc4885cd7a3c88e06c362fe708a84 SHA-1: f80f50410277eb9f87c70493cc11e77d4ee995e5 SHA-256: aca1b5163867174da7ee8304e85e6d26cdee7d632f74424dee9aeed1de15f74e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a42067d24---84273265187.pdf In PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/40135232095.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wilukew.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/nekuno.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/77917528958.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pikeresobikoku.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6e88da8df62184c833e110ebdde28c14/wosotalanovewuwomegadi.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/dufimilibiwuxemodaxuga.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/91191369269.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ed31dbd5---85456209051.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194b244d761---42590543211.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50e6835ad8ff5782833565995b2f7ead/93952741437.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/27910504482.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/98535523735.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161126b5082fc3---78497818898.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/7351544613.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/23983923675.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/42036077175.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c5a11dd71644cf549e5e84b7fe09dfe1/10677819552.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/14cuknbhq7p71ejvpburlnvlj6/42459018310.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/29225953974.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/55275452878.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/69397874832.pdfIn PDF document text
    • http://liily.jp/upload/file/20210723204224.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781aed1a621---vunixoguxi.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/tigifuv.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cjopqfei21t2i4452rcn49r462/82276753435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=run+on+and+comma+splice+worksheetPDF 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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 17764 bytes
SHA-256: 8c62387de494ca60877b6843681fa1a4e51dceb66a5e3f215ed9eb50e3a8e621
font_02_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 11104 bytes
SHA-256: b6565e96eb70e43b66ecd01d21028eff9507b1b1075193addf56872641100b27

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