Malicious PDF — malware analysis report

Static analysis result for SHA-256 5567c47c2eae2c7d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 02:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8ec9e0163c88f0c85ac2ea48fb0cc5b SHA-1: 31b9c82b3affb588f2a4e4db6912a922fdc2db7b SHA-256: 5567c47c2eae2c7dd7b46897a802da3f7ac267364a6c11d489ea79ceab799706
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous external PDFs, some hosted on compromised WordPress sites, and includes a visual download button lure. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to trick users into downloading further malicious content, likely exploiting PDF vulnerabilities for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yuha.be/_files/file/65838459064.pdf In PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/puwovowemoxejovugivejin.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/5658334478.pdfIn PDF document text
    • https://grandegroup.net/files/90581574012.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/xetutiv.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/jitunidodavikipaxoluge.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/kexuwepedajezavifej.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/10139351245.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/pinezusor.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f7ce1e36---guzogumekovajetizosag.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/231041371.pdfIn PDF document text
    • http://ukrfirework.com/images/file/97719568883.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_8F5B52AD19138A73.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/wazakalis.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/98780873623.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff669f1e1---konuvolelevifanigew.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/loxilefumesibepimovuwu.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/10540951713.pdfIn PDF document text
    • http://nscenter.cn/upload/files/95917711724.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/tojatami.pdfIn PDF document text
    • https://tuinvandecruys.be/file/798048505.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/632e81105cbd5b93473d32f52a6eca50/dadopozitajutoguwa.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/petagututoriwevum.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c6fa36c8---vezowurorunokubanuzusarul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wifi+direct+share+androidPDF 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_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 10520 bytes
SHA-256: 37c6255b99ccf07cdb5301659522c55fe11f9c82f22040713d1cb45bd8cf89ce
font_02_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 17788 bytes
SHA-256: 88c7bd9d58592ee3e37923c41c05f1eeba7e670a7d971ffb0330aa6138a43758

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