Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0456fef047a1e7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 19:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e3fe1c41bbe482191bab23aeec8aa4b SHA-1: 8d73a825c4dab2349930c0479b47b97d7b633d5b SHA-256: 3e0456fef047a1e778e1090a2d3d4ffd8ebdb5440f7a7253000c1b3c2009d666
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics fired, pointing to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely intended to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=sustentabilidade+ambiental+em+mocambique+pdf PDF link annotation
    • https://smobiil.eu/userfiles/files/gusipelenagivoz.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feduto.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334672d150d---dagarutuzep.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/fufudobagusefip.pdfIn PDF document text
    • https://biomisszio.hu/tmp/77785033888.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/38709820075.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/viwodud.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fudaminid.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/ximibalijo.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/90111314343.pdfIn PDF document text
    • http://vpsystem.com/files/fck/36032691165.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/84340825899.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/5131888885.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/5fad7ce7645b781abde4303593778ed5/zilikuxurazepiwovoko.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/sodojiluxugarebugifixomab.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/16199244258.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/toropizifefedoba.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/pijixuninefoxoxezoro.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/jurexokufi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090201531273499.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137b476c83c6---19841947206.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/94332707248.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/ranulilinexikixodekodolix.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132080e86bec---vebedofoseteruk.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_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 11140 bytes
SHA-256: ef2fdc9d7e330e8acee472a29e39e166746b65f301bfa364637000d127ef5cef
font_02_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 18416 bytes
SHA-256: 2c6b28b1776d3da2c2e000a03d0de4407d83c58712a531e2d3d6f9b3c36a5371

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