Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2f2e8fe8f8967d…

MALICIOUS

PDF

98.8 KB Created: 2021-07-25 19:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 169894517a537d32d5ad227ebc7df13e SHA-1: 71f0e4b10b254f5b2186397356d8e33a23bcd9bb SHA-256: cd2f2e8fe8f8967d1281fd4a679d7e637246f8b290b0b4530204993de9db2d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were directly extracted, the structure and URL patterns align with techniques used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7e026b74---28753650103.pdf In PDF document text
    • http://copingconversations.com/userfiles/file/34061706096.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/samezezujuweripazavorakis.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/taneribamomisabavopalu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0379be4b29---65092906569.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/rinorokosanakakimos.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/1491267215.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8d31e262aeab563d0d698fafb469a061/lebofozutodakujevoripad.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085529518353---tasalerurafagub.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/nubipeduworiputug.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d94c7f62---gevirofokujamu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a253787fc9---zotigolofazimoten.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/muguvurepuxoserukoziwiva.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4bemqvfkuunees2rat5l4prdr1/kowivipuwejuwukudaw.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/rteob8qsgm29bin640o2dr1l58/ditipomekukibe.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f58b5171---gozidupexuvejesesam.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14430513810.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03919325f0---bulal.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mapakitadinawax.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/ruwozaxanewoxerusobodes.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/79344322726.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210621045358.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/71883298411.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/mefadafatiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+automatically+download+all+apple+musicPDF 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_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 10868 bytes
SHA-256: 5b09ce58e0dd2011b2790d7b546e32b2bdd6fafef853923d53db62e15cab20c0
font_01_sfnt_off00013524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13524 17712 bytes
SHA-256: 66108128bc7f541ef564709de40f3428d4b41f60ace72f4252e7588023a519a5
font_02_sfnt_off000163df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1