Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbb8848b995e1d6…

MALICIOUS

PDF

88.7 KB Created: 2021-08-26 04:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2674a430545307590178fbb5b174cc42 SHA-1: f7733ebe3f0df5890d37a1d12d2d2365d07a639d SHA-256: ffbb8848b995e1d6e353834bc949e23c985832572a1d86c6c4353f9b707494ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e0084a67db1bf0dbd2be5da14752abc8/25013572553.pdf In PDF document text
    • https://combrooncom.com/contents//files/24989852092.pdfIn PDF document text
    • https://eventaipei.com/upload/files/dovogadawujo.pdfIn PDF document text
    • http://unityproductions.com/upload/files/fefaxireduwirokupelurilo.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/40984746784.pdfIn PDF document text
    • http://mcutech.net/files/10299664693.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/56763153271.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/45863950404.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1802cf0e---94072772301.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lupak.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/bunuduwobodimad.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/tilobutubebux.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/83645882367.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/51421843717.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/boriwotakanina.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/79648397495.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0d8f382860b6dc378c155dba6194ef23/gemovijimog.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f13b0ce8f148156b6a78418999c561e2/zowofut.pdfIn PDF document text
    • https://papiratisk.cz/soubory/bisugubobamojenokab.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/wunusop.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/votepupamezixetesowesadaj.pdfIn PDF document text
    • http://healthywithhart.com/res/file/fupivipaxul.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/jcft51g9gom96idsqfvge75ja7/7572343622.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bb0e070907f6879cfe80c75a83b36f86/vufufaliwewusuvinetedomu.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/raxofo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i7cvcqg1vnvo5h31h25udnr2e7/zobato.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070396a3fd---munuveworadafimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=checking+account+and+debit+card+simulation+1.2+3+e1PDF 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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 11592 bytes
SHA-256: 06e3bf00fc1cd2ed2b78b0fb26e03ca51433561bb98eb682845a854bd8cbd977
font_01_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 17136 bytes
SHA-256: 6c99662603b216af3b68c128b4b55db677b63fb741f2eeeaa45a6a10cfb16772

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