Malicious PDF — malware analysis report

Static analysis result for SHA-256 85be8d25b9b09797…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 22:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7181301425e4a7675807f00ab224915c SHA-1: 88d14ffff33cbbe5a12c9f592f4c775a862c55cf SHA-256: 85be8d25b9b0979723c41f6c2c29fdcd09fb28415a49adeb3d7781a34de2a4d9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, impersonating cloud file-sharing services to trick users into clicking malicious links. Several heuristics indicate it's a link farm hosted on potentially compromised or disposable domains, designed to redirect users to further malicious content. While no scripts were directly extracted, the nature of the links and the ML classifier's high confidence suggest it's part of a phishing campaign, likely leading to a credential harvesting page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://frigotechreina.com/userfiles/files/59506751993.pdf In PDF document text
    • http://uekekb.ru/!upload/files/wivufatezuvekimum.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/jeradeweber.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/93652594027.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc06e94ec---gulure.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jezupuxar.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/93287798885.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed53dd7707---nevuj.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/futaj.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/zanirunal.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/ravesovozazapasororogan.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e61cbc8cbcf6214e787e7c0f0f582d27/bawatomabowezavunonotaz.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/49849825998.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/62825347032.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/45259497127.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f75bf33f---gibosedufenotaxapebu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/3916995707.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/82626088004.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/98077925869.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/pizujelilox.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e492f36b02---5635592530.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614018a33c9be---41124881156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=transfer+pictures+from+iphone+to+android+phonePDF 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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10904 bytes
SHA-256: 23b75f7507dcd0051c223f37292e9d3043f923db96bb6ee9c414cecb2fc710db
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 18364 bytes
SHA-256: ba7c3cdbcc4fffb34711ea4b58b2a635c684da6ffae096b7b09c4729cb85149b

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