Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd44eb5d3213bd5f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-21 12:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16de621ae092d1fd8c666bfc401d23ef SHA-1: 1dd2b431cf353d1eba344616b51c90b4b268689f SHA-256: bd44eb5d3213bd5f1e8778090a1fb5078e5c0f75920b5103eaf18f7bd2ba1b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pes.edu.mn/ckfinder/userfiles/files/51941247168.pdf In PDF document text
    • https://arte-salon.ru/upload_picture/doregedu.pdfIn PDF document text
    • http://ceroki.com/image/files/riguxidajubanafu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613341eecd8c8---47727131510.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2043b7f61---68925587359.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/81945895237.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tarepuxinedokegafigeres.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/valup.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/80591136296.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/degosuzewen.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/vopewuvunefivefab.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/27153747622.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/37360554225.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210919151157_785287547.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109080021227793897u148v1egnjt.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/rigowelumavinaribopobine.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/31086817367.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210916144958.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562fe7bdef---31481542003.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/borifofewipelidapub.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613c723e8dc8e---wefotopexupox.pdfIn PDF document text
    • http://knipia.com/userfiles/file/9647798422.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/32080912057.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kotinogoguzupavaweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=raya+and+the+last+dragon+full+hdPDF 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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 10800 bytes
SHA-256: 007fd0bff422d27ab8388ab1872782d965919eb4ee42e1af739c8db235c3ee0e
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 20928 bytes
SHA-256: c24f29069746555c71c5201dfd998fb2eb81b45cc3a334c9e5892699c886fccd

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