Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6ff36623dba3f5…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 19:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64ed9743ec83cfe196a4f6a23abda233 SHA-1: 428250bcf1ca497f6e2f35deb3d0ec703004f08e SHA-256: de6ff36623dba3f5934669b463f850c27788ab0c4e2c777698508fd9a71cb1f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=one+ui+3.0+z+fold+2 PDF link annotation
    • http://medica-eg.com/userfiles/file/disafu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb8f68177---wafodifora.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/82814941983.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/15928249126.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af738857d8---89142149565.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/3358837552.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/vuwutimufikawona.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/m2f9320hnlfm8s9o91cqluv35l/gipobenitaxudutabovat.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/fopibuwegakikijiz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a50f2e808ba9afa5bf042bd91bc3ec2/gesodexojunub.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/ritamamisukixomabasefeg.pdfIn PDF document text
    • https://somogyplusz.hu/files/92921257573.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/mirokuno.pdfIn PDF document text
    • http://lagrupacio.cat/file/10424988082.pdfIn PDF document text
    • http://njxinbell.com/upload/files/fijawaseved.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/28051755893.pdfIn PDF document text
    • http://capableapp.com/uploads/files/xojevivali.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/24/file/55100319173.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5mcltg57j8a5279ac7a8cdki0u/kafogakafatak.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/61566091108.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/90832877286.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63ce4e2f1---wezarijadozaxi.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/nutinirasimewoso.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0844a323a---niwolipazanumibezivavoz.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_off0000b39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 10484 bytes
SHA-256: ad3b9474270c2d93003ba49a141032fee4d349f675ed1359558fd7800cb64859
font_02_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 15852 bytes
SHA-256: 4430ed07c2502340767a09766f32956ddd24a5b3cac215e36db00b1a40895fe9

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