Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea23f2c3b7848be…

MALICIOUS

PDF

91.7 KB Created: 2021-10-13 14:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9da0e7231cc79c4c092abb1b30a0b69a SHA-1: 8eee1806417b9800b6a2f76c2c86358ae8e9de58 SHA-256: bea23f2c3b7848be50a2c60e329bd83e70c52f38850575fee7cec5dc1dba892c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16161e80d1c2b1---bakopimor.pdf In PDF document text
    • http://clingac.es/d/files/70115569632.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/jadugofumazumuxe.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/getej.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/22131301895.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fizizosozibaraxeb.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/50812892263.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/givopaz.pdfIn PDF document text
    • http://scantech3d.com/files/fipedegavatejus.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/jeziwaxoromiregovuna.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/tudimoradusipamuzumetom.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/guwenemomonusaxux.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ea5e375c5c25b933f0f5d8813c6df32f/nawakofunup.pdfIn PDF document text
    • http://puisan.ru/uploads/file/deborutuwexeketazomofiv.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/12608078402.pdfIn PDF document text
    • https://hn-as.dk/sites/default/files/userfiles/file/kabanapotomenupaw.pdfIn PDF document text
    • http://mariellatriolo.it/public/file/3022621000.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136398153bc9---73669170886.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/jajum.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/42498148330.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/38741955943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=18+mbps+internet+good+for+streamingPDF 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_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 20868 bytes
SHA-256: 8bdecfa28ff628769679f8eccc461bdfa5731cf3eef7d9080183d19bf7910691
font_01_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 11100 bytes
SHA-256: f50f6f785ed8c0cd7b19cc98824ff3f74ae03bf55b041c2fad128e486b8ec6a9
font_02_sfnt_off00014941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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