Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ace2d72a6daa9c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 00:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d42c9033de86b7f774cfd1e97ec3970 SHA-1: 606d38154038d987aa1e2c28ec08b64f4f57bb40 SHA-256: 22ace2d72a6daa9c304fd4317cc3fa1c6031f7dbcea5d24d60c784996e003ec1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://rdsdealers.com/ckfinder/userfiles/files/29063443734.pdf In PDF document text
    • https://paidionresearch.com/userfiles/files/lesopifefetidopa.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/h4dk5ujnm14smfk884sk2koekl/71807220855.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161301a4423cbe---13195131137.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/redubezej.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/mixosa.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/60261584709.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/26772968569.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/lekitulewenufexeralebeja.pdfIn PDF document text
    • https://olterus.org/contents/files/87285180723.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/14124436725.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/12284348427.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210906174955.pdfIn PDF document text
    • https://endobible.com/userfiles/file/bavipuwefagomuj.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/35361830522.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392476dd697---julajowobogunozarozej.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/18517888602.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/62334208684.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/48519187054.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/30083192302.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zumemejirevag.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/febim.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/sakonuvoborujanux.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/mebolukap.pdfIn PDF document text
    • http://enewind.com/pliki/file/sonikogogenavedotefa.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/13610260956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mantak+chia+taoist+secrets+of+love+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_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 10868 bytes
SHA-256: 998bdbdb33cad5ce2538c58c0e6ff3a8328551ccefdb4c1013d90970d86baa41
font_02_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 16884 bytes
SHA-256: 403338e465bd4803446656221b9eaa3abc29f297f0454ed590f3ea2202fedec4

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