Malicious PDF — malware analysis report

Static analysis result for SHA-256 de65554ba86909c6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f4aa12cdae02b85762e8336528c8312 SHA-1: d8fc388ea83e2fb0ae2e96780a959e9bcbef55ce SHA-256: de65554ba86909c661102ccddc7d7e7a3a1c31bf3c6767bef5fec013e8181814
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the PDF is designed to lure users to malicious or phishing content, likely leveraging the embedded JavaScript for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161302527aee58---32099841950.pdf In PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/sokes.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/pojazofobazogarurapebir.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/76731625889.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9e3d0ae7---90039979142.pdfIn PDF document text
    • https://forssh.com/userfiles/file/mibojo.pdfIn PDF document text
    • http://hanshintech.net/data/file/zotedujutijikozufaf.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394c3fe20ce---mizudagubelokalugavufo.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/93629971782.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1d57025dce87783d2cd5c65d385902cc/72611171480.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gijori.pdfIn PDF document text
    • https://ms1oke.com/contents/files/wajijuzujelevuritaduroju.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nowuxijagemume.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/98743201487.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f333477a---juraxof.pdfIn PDF document text
    • https://koratspring.com/upload/file/86583790258.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/25285264192.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/6989345084.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/vizotedugirelojebavi.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/fizol.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/99371823512.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/93449948456.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/gawamozugufoge.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/tejofemobegisovexabuboja.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/xirezo.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/72125725064.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/81538263898.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/vfsu874gjoj8e9f76uph5f76hs/vilerukoxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+search+volume+toolPDF 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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 10440 bytes
SHA-256: 33909808738c27089efa260654d9d2bdcdeee9299f332891d5013438bde450ad
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 17060 bytes
SHA-256: 0c7245a8a35693186784c0f9f2e70a8ea5372a50fb7eb04092e83134df990337

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