Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aacb3dc0a2080e4…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 05:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f3ccf411d12ccd1cf52ffe3500b579b SHA-1: f3d941451120049867c74d8f842516271ef6d359 SHA-256: 5aacb3dc0a2080e4fe3231a7113df914fef7d5d8e17d29e09a5ca0ce3dc6ffa5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://akinmedical.com/uploads/file/kilavizupetogogapojad.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9fef99ab678da608b223d7219506cca8/bomusutilasatosijoxe.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kt5i9n0e3uajf4n3ipqhubad95/76132126075.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/11692023068.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/kuxiveboki.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/fe35785c78676ef1025a7762e1f10ada/11570291113.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/dolodofemosolonakab.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/27965180344.pdfIn PDF document text
    • http://myphamasia.net/upload/files/vojes.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130ca019790---2163667548.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/14760173536.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160754e081a2b6---99961693356.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/57607846701.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/55278963263.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a868f9230bb---40113457860.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/51955082300.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8d350ee43aedf8149b1cf0af2fbf4fdf/werejonefewumanebo.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/80660842547.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/44887015668.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ac2a4ff0---73371102434.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/53684755736.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/kininibopitixedokekiwutoz.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/fixosidoxoza.pdfIn PDF document text
    • https://123natura.com/stockages/files/wewukogesepoguzaxuxiniki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jekyll+and+hyde+revision+guide+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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 20996 bytes
SHA-256: 1ad65fe5a286de9a17e3d76e384aec2927927fc688e966d1e6329842ba55806f
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 11044 bytes
SHA-256: 5dbd93fcd4d0e2ab2b91c961bea4c71880ac8802010689a0d6daf9fdede134bd
font_02_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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