Malicious PDF — malware analysis report

Static analysis result for SHA-256 776f9334e939785a…

MALICIOUS

PDF

99.4 KB Created: 2021-05-27 19:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd155c89d6b9b15e089259affab1a3fd SHA-1: e11537388d9026ca74af12fe039ef1136b24de0d SHA-256: 776f9334e939785ad2931da7ddad95fa6195373f70b1d499fc156af37e6aad94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified 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 external websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://ebsenglish.net/_UploadFile/Images/file/niram.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9732f95a51661823cab615e148b4f543/jaruzoxanozubixojunuriko.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8baf7012ae32dbf75782de2a0107c89d/defoxipusawaweluzotor.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82208bd37---95146451706.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1faccddf0678ed139297c24223664606/xubunedazetipoge.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f5a4ac3aa7d0674302cd7e736425282f/rinalebukuxavinafopad.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/jiwetaxukif.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2930bfc0f---xivesatutirudinolige.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a3jthr74u9uj35ulrc851i4bt2/moritapokujaxejibe.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0b89e0c7---lopatamezivumosoritovu.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/56588856230.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160920d728607b---fuvudopipawivimaxi.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b807f63cdcddc54903052332fda6bc4c/gupareduxili.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/74805049403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=card+stacking+examples+in+literaturePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001457c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457C 5432 bytes
SHA-256: 423fa41a70e073f7bd83d67989986f0f16c7532829d85e10f09787acdc5ecca9
font_01_sfnt_off000157e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E4 12488 bytes
SHA-256: 5a0f641ed5b4a95dac18da6144a28800a846cac8368692f46010ee3ce4d189c4