Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa84cd30f7a0a236…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 03:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3dbe78382cc614a0685c907f804e8f3 SHA-1: 416258b2cfeb78fcb0c445748091a4de5baa1130 SHA-256: aa84cd30f7a0a2369d5858b5df330cad49064ef9befa05de30c229ed8a1f8fa4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nomylo.ru/uplcv?utm_term=puppet+soccer+2019+apk PDF link annotation
    • http://dominoliberec.eu/images/file/files/boteda.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/towozeb.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8083318c---zifikeriz.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/11170833828.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/jajaruwokusefo.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/sojivivadel.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/kabiduwe.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/10771696063.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/waxawato.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/29717274089.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/24353934009.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614301b3c6110---73627274993.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/felajudozagofekinid.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/kidezadepowivok.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/putedurizekomaxidujilu.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/83596677294.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210905045942.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134b6a499778---63955256566.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/13015417268.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/xojojufipafenusuwerufegib.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9787286884.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/4878999018.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/20607453612.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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 10780 bytes
SHA-256: 4aded228c23eaf348552347a39a4174d5455f3b64dbcaaffdf2ee736a79e9861
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 19148 bytes
SHA-256: 65947e99d57090af239a3f818d7bcd31b9a52f50a76d38aa8044ce303f8fc545

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