Malicious PDF — malware analysis report

Static analysis result for SHA-256 956c1f35cc0d237a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 14:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 627683abff51f9b1e5293ee431b79040 SHA-1: 6bbecf31b08e775f674a4966c2b3694495e088a9 SHA-256: 956c1f35cc0d237aa98315f154f54a407a5e182bb84a2df97a42fe026e92de5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/baletaxel.pdf In PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/25356601310.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/66708813a872e1ae7457661e18b8f167/16184411718.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d172f6f9fb4ab875f2e0156562c2b959/rilivipifiriw.pdfIn PDF document text
    • http://dd-eng.com/files/files/854854770.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/weretusizajepa.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65db08563---94672389757.pdfIn PDF document text
    • https://anup.bo/images/files/jumulolinujaked.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/budinivijuwifuzawe.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/6573685431.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/manepedimefe.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a453184dbf4---sorito.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/1779688526.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6f70d06b04c2c573968f24c638ff8252/defuxutamededibu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3d6ec7c04---92484920634.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/runopawunujokarazeweko.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0d0753f1fe264d1cef8f43e33e2197b8/14393094915.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/puxafi.pdfIn PDF document text
    • http://museeducuir.org/upload/files/futez.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b013d0124---purodisufekidunikil.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/zozuvikuzaxedaw.pdfIn PDF document text
    • http://biomisszio.hu/tmp/gupepepo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/61h7ejh6r7lvqsju32k3in0usm/lotojewepezafegofar.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483eb50be2---71388792299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=logitech+z906+manuale+italianoPDF 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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10984 bytes
SHA-256: 435f30f1a08b5aa49479d840db73864cc8b39684507197ebe59ff8bfe4afd707
font_02_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 18564 bytes
SHA-256: 01c832380ee4d448db318559ca24eff1ee82e8429bd6360c70d6333a62d98acd

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