Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eee7a4599eb7df…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 02:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b5a553dd16e103a89d2329839104a26 SHA-1: 47cd509c68f1ffb44ab816bdcf513223f261f832 SHA-256: 91eee7a4599eb7df4c34982e5304bab4850603fbdd462f96b3999ddf5ae79080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The presence of a URL containing 'crack adobe after effects 2021' suggests a lure for pirated software, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://heninrealty.com/userfiles/files/84536642012.pdf In PDF document text
    • http://sns.hu/_user/file/kavusapu.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/48732274789.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/617dae2f681355cb6c585caf7c4b5397/85170228847.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/56752852151.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/75283332430.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/3523896155.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390dd8511e2---tamigigitaxupowuno.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/10539992143.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/xosake.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/59404219051.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/83783362775.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210917061242.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/juribajipo.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/masofemisojafim.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/17068206646.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/90980908480.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-6/20210906061258966586.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ca91436f---lolavasuvifadujexux.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/wopitusefosolu.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/nisibedepaw.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614357cda1f4b---katejupagufajesozatak.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/zutiwivodulevup.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903072137784964.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/41979115349.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e4d0f184---77566894470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=crack+adobe+after+effects+2021PDF 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_off0000bc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC30 15732 bytes
SHA-256: e43e92bbbf641c66930e0a577d18732dd4e2a1215c789086efc7d705e83f165d
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 10784 bytes
SHA-256: 3000a74129cb0e9f935bfc7a8833e252a0310a2d82750ea6dff0a46364c8c7fb
font_02_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.