Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89eadf61ec24579…

MALICIOUS

PDF

75.9 KB Created: 2021-07-16 22:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7706f17e06089e98abc7ecb38b93740c SHA-1: 2b22cf57283aa093e18bf551966cf3d3439ad310 SHA-256: f89eadf61ec245790b1e2c14cad0c13d0524a5177d61fd021f759d48cbdd3dd2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The presence of external URIs and link farm characteristics suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://tantex.org/tantex/tantexuserfiles/file/74712359326.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/siruzefufopuwadolofami.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b64bec64c2ea07437c8c2e2944304864/raparovelu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e38e086f4e7---78710986621.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/2485916917.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/79989889167.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/chol2ia5ur5adcup84cm8436dk/fudakejakir.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/45177911719.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa755b56ab---48053713042.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/64149425984.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/97285000990.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/gozoziwatozujanepevala.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/aep8gog4rlsnmls2auai6clug7/lunegetirogekulifud.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/28125245367.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/17275063775.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/19875701563.pdfIn PDF document text
    • https://susta.vn/userfiles/file/lowuxobo.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/866869650.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b614460ff3---jikod.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff6adbaca---44315851150.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/moluzuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=west+wittering+estate+plcPDF 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_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 16712 bytes
SHA-256: f0c6a8d06344dfe06f498aa9b474979269640a00e64ca1e65a134b02192d5af6
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10508 bytes
SHA-256: 29c3b0a9031ea57a6f0a10b35bfae1e4a6bdabfb5678d1be2258fe86a93612c2
font_02_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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