Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba240e2bfe32f8d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 08:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c61f7d97efdc0b2163faa3ebbe391e29 SHA-1: f159220be0ea9588cdc4bd365b23bf1dec66935d SHA-256: 2ba240e2bfe32f8d2de04590046f0bd9ed7b2799bfe8f66af60c696856594c57
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The malformed stream length heuristic indicates potential exploit activity within the PDF structure. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nomylo.ru/uplcv?utm_term=download+bleach+manga+pdf+free PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4f73c496---sobesige.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p42jm0j1i6913fecmagpbhf8g2/61800299950.pdfIn PDF document text
    • http://benetalent.com/upload/files/69950497187.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/divowip.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/71294533745.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/nujotof.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/48783250214.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/loberup.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/vibamewopage.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/96576517920.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/kiwojet.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/vejur.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/24581637008.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/85056103886.pdfIn PDF document text
    • http://geotersrl.it/file/90050243009.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/57929824302.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901182115_kdw4u3.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2e6c6424dde69220f2048c11b7e4f315/16202156782.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zigavivexibipuzon.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/46382428929.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109120624189963.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/34863410454.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/lusakaramasanexudak.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/15936059972.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/8176950562.pdfIn PDF document text
    • 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_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 10936 bytes
SHA-256: a36034f78509a12c6e3dfbfd92be6c83bb1ecf884a5b6713495c20c48f7e780f
font_01_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 17176 bytes
SHA-256: 37f6f604e3e4bde930de9926ab21f558e2d83675e6d7e3b2bec980c2f9413214
font_02_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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