Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa3bc94d7062937…

MALICIOUS

PDF

88.9 KB Created: 2021-09-23 17:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85e2864a536b1042704da5a3eeb52859 SHA-1: 7c585bf8de5e66eb22bd264315ae64b76532a806 SHA-256: 3aa3bc94d706293747881e4db68f7519f9368ecb9423ea052f7b08b89f097ec2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links to external PDF files hosted on various websites, suggesting a link farm or redirection mechanism. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely intends to trick the user into believing they need to provide a password to access content, which is a common tactic for delivering malware disguised as legitimate files. No scripts were extracted from this sample, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://slhospital.com/upload/fckeditor/file/fukin.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/28c5935b0618fd63a27eb453850ad5dc/8065361570.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/famunanefe.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/nafagitufeleki.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/nuxukuwuborapixozax.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/43380569855.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/11756607247.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/18335266983.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83b813091---45986038834.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/75401701596.pdfIn PDF document text
    • https://questyme.com/userfiles/file/jakutalanijexezizifel.pdfIn PDF document text
    • https://kueapem.com/contents/files/webelaxesis.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/sadaronesur.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/kirexov.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/palizuvitawuxiwapuvad.pdfIn PDF document text
    • https://yasacompany.com/upload/files/miketonumozexuturoxig.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/xosazituv.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gorexoregimoxuju.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/tijiwobuwegeke.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/18843608883.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/wopawupekaboj.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614029e6e5494---11093759904.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/30016316249.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/nerujijilezudekewivupob.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/gavegozinamusofenov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+krrish+3+mod+apk+downloadPDF 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_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 20032 bytes
SHA-256: cf3eab6de399a703f10b2551bd4836eef805f1541ef20242410efe21b8228eca
font_01_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10916 bytes
SHA-256: 3a54f27a73329d7c5e53e0a4988bf454381c8e79d3e8c430ae08b549b3d7da9a
font_02_sfnt_off00013c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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