Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fe846ea997ec9f…

MALICIOUS

PDF

93.9 KB Created: 2021-08-21 11:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef44f857de4ff95aae89a7bd11d7c29b SHA-1: 24032d19c76e8f352873b9d4f7643eb1178ebdf1 SHA-256: 90fe846ea997ec9f0583bd14049255dc5c06e0dcc7ed0cc9bf6fa412635cc076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=what+is+the+setting+of+the+maze+runner PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m4ngefcavc1sm9feg3vlmshv81/44886768307.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4ec6d618fe23ecc035b1b0e3c3db7d99/duzosobemokokevapivage.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/o0liaj4ho634f9d0jqcctbj6o3/wuwavefebafudepiwefopo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qtog486nf10budpdvch5ukcv95/towadenimuxujedokumasaxog.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/880d6030e8d45fcbdd7552a41dd74007/91532164021.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-21/20210621082505140897.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/57603299826.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebc997ecc---porilefumowirenawekuj.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa4c122aa---89896807981.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/kabodeparovujitifo.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/47386234849.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/reburimutiduvififejerulu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e724374bc---20237504001.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/90683734420.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/zisubanemon.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e288b923---soxisaxelafoverebizu.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/70341832134.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96007cbb20---67595030506.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffd180107---28242760745.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9783dd0efb---rutiwimuzepikanuxo.pdfIn PDF document text
    • http://royalgroup.at/tmp/vupaxomozawojamubudodanim.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3tn1l3m2f63pccqbi0sk9tagvc/magozakisubopasaned.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c288e74db9---93801505126.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608467987d11a---kofolutikotuz.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_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 10768 bytes
SHA-256: c9cf7e5f9796976fa9bae5d5563c86b72173f513ecff1dba04de7f4ca0e8c194
font_01_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 16864 bytes
SHA-256: d47909eceaf6a9ee1d657d4912a085f7feb949a6731c3134329a812041508a70
font_02_sfnt_off000151ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1