Malicious PDF — malware analysis report

Static analysis result for SHA-256 183f1de5311a1299…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 00:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db15abec244091cb84aceaa15af5dacb SHA-1: cfb0c589b0e7cc7ba874534957336fb084a406ca SHA-256: 183f1de5311a129905390e36f07b290b97a36094ddea6fb89f366e51bd404dc8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URLs suggest a redirection chain to a final payload.

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://tentimesneedlehill.com/UPFILE/userfiles/files/vafujenasor.pdf In PDF document text
    • http://x04ydivan.ru/userfiles/file/90716818548.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/guwifu.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/67298149318.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/30868668447.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/24348284164.pdfIn PDF document text
    • http://hueide.com/upload/files/modusasa.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/12655090999.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/91795768492.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/lipobajozifubupewunupat.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/83501657378.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/50994428623.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/22529585723.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/38737491825.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/91491878254.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e526rjeoevov0s70tijltv19i3/74185529660.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/5242252093.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e2b673f8---8335482581.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/39830146758.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2ccd5442---jibanulunulujifumo.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/sinugewaponefavajiporo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zotire.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/74778409133.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/jepomifinusofifofurem.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/68489639509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pok%C3%A9mon+let%27s+go+eevee+apk+download+for+android+freePDF 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_off0000bc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4E 17844 bytes
SHA-256: b7fe86f50a72003e5172e91d4d14c2c858d65ae795b9e4f47079f51f1cafa652
font_01_sfnt_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 11276 bytes
SHA-256: e0ac233394b9224bdb02f17f394dcf341a576a186d2d23a7df710763cf49b9db