Malicious PDF — malware analysis report

Static analysis result for SHA-256 df891a8e3b2f4f9f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 17:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 982fd60dd0435f0f6a20a4d4061026ea SHA-1: 0cc6a93ce7f534543e7fc561b0ebcdd7e88daff3 SHA-256: df891a8e3b2f4f9fa549d4fe625e926cb2be0623b69dc84115faff5d30cfdea2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+know+my+android+phone+ip+address PDF link annotation
    • http://sreema.org/FCKeditor/file/mibuludituxajinezefup.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/eanq8jcl0jm1l443a16h7g4p92/74739207270.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/30512283060.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/bamoluwolepijozupo.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/vibutoxulobud.pdfIn PDF document text
    • https://senfina.top/uploads/files/fegidezuluwatepetijadum.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614dac73aa428---vamoxatewusijozalew.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/68831027191.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kezikemijulixutuvunuzepi.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/bejakozodifirefoken.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/74013b99245c6128fa38c282bb0ffd6c/koziwugi.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/japopazadiroxenuliwefom.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9fd53e2c---tenovawak.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/54875482376.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/69723922958.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/figibitiditusuralunon.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/momokipazaf.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55805703680.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/90aeafe0791590b8b7e25420032fef9c/88959639595.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/12735410083.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/lisitivaz.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/bejovujazuwezew.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kegezewewoda.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/97373420006.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/wemijafakaloraj.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/fujudule.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/93932550412.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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 10896 bytes
SHA-256: 4e009d5bea08df43dc028dc9e32f258427abaa83857f2e5b065a5095b8dd5943
font_02_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 16472 bytes
SHA-256: 43606c591dc0172291cae9644e7dbe5088f66da4f8957d7321e391422df567ce

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