Malicious PDF — malware analysis report

Static analysis result for SHA-256 058fc0527dfde53e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 21:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddc96ae70abe8b8f508667afadeecab8 SHA-1: 07d50326437495b8cb5af4d4172dc82c55300504 SHA-256: 058fc0527dfde53ebac69d80e42ea1a54bf1603d96ba42b964a7c46314fa7d2a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=social+development+in+early+adulthood+pdf PDF link annotation
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9209453a7e9dd86abaf1648b9507a1b6/worepurotep.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/16225773863.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077654f0ec1c---falamadetibok.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/83046990017.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/44895794977.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/ruwujozewuwixojuberewawil.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/v3t0fbq1e218rt7qnpig205dh2/vebepataxikoseludiwavimej.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161134eb46a774---xakilisatupazukilajuzemot.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/88084336160.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9bac68e93---23494363470.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66507169e---benezunubaxugore.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9db7a27a3---jotadoma.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/gakidixupevuwejibefe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b048cd8181f---jipubotunotopefofefedebap.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1655c0e5---12257427422.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/72792810592.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f520065831---kerabubowufa.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc5aba2e2---lerakapofilenedug.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/givebasatikesasix.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ef242405---425019932.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/liguvejuluzegev.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ba7190804---tuloxazaju.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/onjd7tu0jd9sfmf17db6sbbhu4/pozuginewulofomivotoketu.pdfIn PDF document text
    • http://www.bash.cl/media/file/mutaporesak.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/lunudubopisabo.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/papasoxivibix.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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16976 bytes
SHA-256: 964a994a4279e2aa115e4bf3050fb8de51c314271fdf2dc389d59ac530604ea3
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 11072 bytes
SHA-256: 22389d240b0df65bfd0644f677d034e67b6288571f613793ce396fe3e6a77076
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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