Malicious PDF — malware analysis report

Static analysis result for SHA-256 dede4634c6c61be8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 19:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2558fdb434e88ba1de8c9710e31ce843 SHA-1: 4c586f08a5167fb9de236854f629d6a54c8daa43 SHA-256: dede4634c6c61be8acfaa9a6a93fd354a12539c3a8d3e19c1ebb5f128123c0b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised WordPress uploads and potentially disposable hosting. The presence of external URIs and the instruction to disable security software strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely involving the redirection of users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://synerhu.ru/uplcv?utm_term=android+emulator+on+virtual+machine PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa9e2ce10---divigamu.pdfIn PDF document text
    • http://pneusmarene.it/images/file/66068724007.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/sogikubujagerefo.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/duzutabizobupukuxuni.pdfIn PDF document text
    • https://pratham.one/file/88037805426.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/dojamebinoborakeg.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/55905550552.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tevorowolufe.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/41998751809.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fimisesolodupa.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/63828770376.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78431734393.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65599191659.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/laxuvuze.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kigadumuxo.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/15682914296.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/37679711485.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902034539977886.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109082049229704.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/35100507800.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad70bdf070---95699300763.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148db236daed---733697077.pdfIn PDF document text
    • http://snft.ro/media/file/53376608201.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e52010591---8274029004.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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10612 bytes
SHA-256: 8e65d5d821898f3fcc0e081bc08a53ab2122ed87be2091d71386915bf6c44f6d
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 18160 bytes
SHA-256: 60c311e27e9e51d631c7fcb994bbe0f5a83d4976bf6bcf7863f755a4cd4940c7
font_02_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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