Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3fe02862c872b5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 16:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28a5ddf52b0a446c508a4a766540b1ca SHA-1: c1aaeb6d1f58850de69f99218660a3acff4d079b SHA-256: 4c3fe02862c872b5d785db09dd85df63078b25dcfa6141b3ca4898bd6db5dc6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cdseoulps.com/uploadfile/fckeditor/file/panujig.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0ffbb1e5b3378450a5cbaf998c444a1a/xepafim.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/858a7817066123b7d9f84c1725816146/soxoxuzidopaginafetuso.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wugukijixepagapifideniw.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/darikabunubusefof.pdfIn PDF document text
    • http://mlead.net/images/e/file/losazovekibop.pdfIn PDF document text
    • http://emannsltd.com/userfiles/benasekokewekuzukojobotov.pdfIn PDF document text
    • http://ipllaser.in/uploads/fusixabozupotisutadeju.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/vebanuvepamowusomo.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/83862522530.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/vexebovokujabuxoz.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/kojuzinogekolagumufugeko.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/wisafimaso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3021f631---tedaronenesak.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb689c931---ponomuwegaramugip.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/wefosidonab.pdfIn PDF document text
    • https://digireg.org/upload/togipobisasuxak.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/fekugowemanebixapij.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/23638291956.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c4d6af507536dae7f4703231d3635445/75078220014.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/83481431704.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/15830911630.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gizibebagurukufupiz.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/nevegowarorosanulavele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=d%26d+3.5+prestige+classes+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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 17568 bytes
SHA-256: d2f26477f2c9c56b5bd41aefa2c24981137218b8a55be38930e226dee58e5d12
font_02_sfnt_off0001224d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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