Malicious PDF — malware analysis report

Static analysis result for SHA-256 1630a18993a3e853…

MALICIOUS

PDF

85.3 KB Created: 2021-08-23 10:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49202fec5dec672648f39ef2965b1282 SHA-1: 59abfe7987c26a829dc4996846a6f3130fc75660 SHA-256: 1630a18993a3e853c06bec7b68464ffa7de6d3f2a659f8d697e2429b00fbcfb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while many are marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f1188add9357f8d7ca65cd83f3ba3dc2/35670020101.pdf In PDF document text
    • https://kawanmto.net/contents//files/32173563483.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1603cf7a7---pimevu.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/xinoseje.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1962c02c6161bd503cbdd1af8f02f344/jedapupokoxodisarasad.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ed2b8fc4---99190904358.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xejerinapufosovel.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/pemoxi.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zijiti.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6db0694984ab304a1d5e11147e603a50/28934238546.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/74504826800.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/78156639902.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/36736175074.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/75aeb4a80294d16dd901ea7cefa6d634/numirolosaperagobi.pdfIn PDF document text
    • https://haidangpc.com/contents/files/38540190890.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/86801842090.pdfIn PDF document text
    • https://iwistw.com/upload/files/78631645408.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/169625381960b3ca7dc8345.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857c046f3f---43534615333.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/16591551940.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609286efca9ae---sowevavokore.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b90fb3248---lexudoteteruxuwudebetijos.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/ditejiperipin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=level+53+word+connectPDF 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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 17760 bytes
SHA-256: 899be1f18623a9933ed5d6edcc67afa76febb96b9ce84641d6494a5eb9182f5e
font_01_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 10356 bytes
SHA-256: ec5539770ccebd898a3a95192028ce6910f6714f8ea9be7c790ed99e0be37567
font_02_sfnt_off00012e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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