Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8895cca31d142d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 13:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33ac77898dde56326e3ae1d3df1fd0ec SHA-1: aa21a13f36af64d59cb06a0dab464871b3c0262f SHA-256: 9d8895cca31d142dcf7db978b1b6b449b4ce698a4292b40b79934dbdb17ec1a6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing campaign. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or trick them into downloading further payloads.

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 https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/cmh9tq0ai30a2o93bbkhuffd8a/52383586987.pdf In PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/52159820527.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/najixadutibekez.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/78913110024.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bd2b70b8---nezogozifudagefedudikeli.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/45605873163.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/nevajago.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/65792384569.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/wadavojed.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161333e64b0e17---89007714642.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/48006137222.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/ruxexuwiwupezebefula.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/67719063757.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/35085847496.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/45865304407.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dugemamopof.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/tidara.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/27887526519.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/popifusa.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/58010059267.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/lidog.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/bixeragadixuzejigitugurol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=organisms+in+the+animalia+kingdomPDF 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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 18024 bytes
SHA-256: ece3c0d1a367f2cfdc98d9bde7b728e5d74b3a5075782d2da1f952058657af15
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10812 bytes
SHA-256: be895a4eea0ccfac40a0d99ad5156aabe2d683decc7baebcf39b229d60b0dba2

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