Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d21f1191e160767…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 10:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 684a32e684ee7a9b4c32afa1221860e8 SHA-1: b0e7698993bfedb531c33d51507d2a360347da22 SHA-256: 1d21f1191e160767a6d22ba1ce488c0cf011bf35b29b36025fd22d3f29019a8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • 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.
  • 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://sjar-tech.com/uploadfile/file///2021051516045591.pdf In PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/weruzenezemaviwuxum.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/57335301236.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jivobadugowetatixesa.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/didugep.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/55173256673.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4uam1edt8qlt7cfd3ggtapohq8/70284687249.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609009b4e545a---lapidunugivori.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e172deb3b---35427514754.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/kepazo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0876b9a968---23921725362.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ggeuoj6f8bq92arrpi655258ia/97251844383.pdfIn PDF document text
    • http://strandedtattoo.net/file/liwowipatizinibajamujeva.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/bejomaxukesapijoputofoti.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1810cf023c---xaxunenolobijowemura.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/22781439100.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/35266126881.pdfIn PDF document text
    • https://paperland.bg/uploads/file/wotid.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/0cc8e0dfec69ee146826b1be1e1718b0/24619627437.pdfIn PDF document text
    • http://meskerjager.nl/media/files/38119338084.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/sevodudunufawamizomi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/135809322e01cbf2c1a02d911380a375/58031555925.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/42853001233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=definicion+de+enfisema+pulmonar+pdfPDF 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10784 bytes
SHA-256: f0e7bdf8f2ea633e30e94db11e7c5b035f6972ba461fe99e231c4359cbd368b4
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 18304 bytes
SHA-256: 211b5296ed4f9e85a706352f899f1a9a4c5565a985e6f71ca4a2e66ca08c8c54

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