Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8550ef0cb53afa…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 11:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db8e4742e832d94732d12d68a730ed91 SHA-1: 177139443824521a01547549af1d1499d33191dd SHA-256: 2d8550ef0cb53afac48eaa2e69cc292cdd2565fc482fb625a25037badb49a47a
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to host or distribute further malicious payloads or phishing pages.

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://wastran.ru/uplcv?utm_term=teoria+trigonometria+1+bachillerato+pdf PDF link annotation
    • https://stw-nowogard.pl/download/file/xiwizigevuvutab.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2b301b572932cb6a0231a27963cb715d/tipulegidelebuwixali.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/letusasedatemoraw.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/kutepukegawebeni.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/94277922231.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/59790157866.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0pkq8jmjcptdtq5b0fn584ehd0/30581102726.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/getugomiw.pdfIn PDF document text
    • http://qdjshg.com/files/file/34604771338.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1abe40ca59dab04a4db95c08514afc13/xupizivi.pdfIn PDF document text
    • http://yuha.be/_files/file/38231289657.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/2071239114.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a4c80f89---gorusolufarezaganubodefex.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d28524a44c7---95299868212.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/mirivotolimererepobim.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/wawudizubajoluratiwola.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/67020860775.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/jajodipeduxoba.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/53209039934.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bsmoaavkctm2smt3j31cvh5p72/56545125559.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c372bf869b1---59867366454.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071294f98701---gimesebuwojusadimuge.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6035d2cc6---lunubikubavowerewogepal.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_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 11056 bytes
SHA-256: ba21a7f6d90c1e0e113a0f7e51788a602e75772fd5a08cb96b631b670270b338
font_01_sfnt_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 15840 bytes
SHA-256: 8b67ce22b4c18dcae6322343f2538ab8da3498efe05192f7e2db6ba17f9338fc
font_02_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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