Malicious PDF — malware analysis report

Static analysis result for SHA-256 848d056b0cfedc63…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 09:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb60d4d8cf3e270e3e4a7f793edb68fb SHA-1: 4171f1118b758776e0be61f2321e15f3df6c7a49 SHA-256: 848d056b0cfedc6331c1c5bd4447101fded4d581d6b642cafa16419c9d284056
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to trick the user into downloading a malicious file. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • 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://lammensfilip.be/uploads/files/3456454373.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/r8t61qa1vl0h9mbiokcglbsia6/ruzoxanur.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab179ed66---kefufedomewa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b31c08fc7---69942433596.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/jupatidurenodufuzoruto.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/lanasasukikibo.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/bitofaduna.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/vewekukodo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079179107f0f---jivisolipepukofet.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/janosuw.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/78857149039.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210722_773BFCBEFA61D301.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/53883766569.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/2828543956.pdfIn PDF document text
    • http://partnercable.hu/files/86279543726.pdfIn PDF document text
    • https://p87.hu/files/60260537619.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/telebizidepazonab.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacbf1cc2bc---mixezipag.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zavetetutij.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_0C19670E60CE0FAC.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210723_75FD09B02A96035B.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c12988ef0d---kopuremeg.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/31753060770.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/wuwuvuxewafumat.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/35206624473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=taxiwala+watch+online+moviePDF 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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 17256 bytes
SHA-256: 4a3e2eb69d582be3fbf6166191a7fd28b4f2e86085da3c453382a46efc823cdd
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 10444 bytes
SHA-256: 0045a327adf7f0d0f2c987b9e63c28566f6370982c6f103d58cc7f0bb5c78aa1

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