Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ed5fa6b34cdc18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 05:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 339ee8654680d927ef07a5fcce3509b9 SHA-1: 3a9c0c32501bde2cf77cdef3cd26af5eeeea3d9d SHA-256: c8ed5fa6b34cdc1868df4451453317ba222589e0eeee742c0d48327cce41e7db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

Heuristics 5

  • 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
  • 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://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c4ca7317a808ed44695f1c83f85de3e1/kadajalavamevo.pdf In PDF document text
    • https://sharks-cz.cz/images/file/12157116589.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/patas.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/96379013132.pdfIn PDF document text
    • http://hzqzg.com/d/files/37821966115.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/83524617029.pdfIn PDF document text
    • http://turnyras.lt/Files/file/fodelulositapavamavek.pdfIn PDF document text
    • http://mp2020.csysadmin.com/ckfinder/userfiles/files/lagolobevumoferif.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148ef2ee29aa---64157520876.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109150355235840.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/sixotivu.pdfIn PDF document text
    • https://semut73.com/contents/files/runomaranifepu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/lutekafilogivezelelilobuv.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qdo47qs3a3n1ja4kcc3pvplmlg/56045159623.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/07e0d9e3d826c27bbdf5e5719c48f9f8/baralapubenovu.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/fudabafavunakugajekibeku.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/wafebinamawukakunopako.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6cbdf5822e30c970465e06816c30c51/25841965816.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/68706590965.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/01456ec127f4cfcb166637e4bb58c514/98907959481.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/nufufijos.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eabc87fd659ce15044c9bfe775f5996d/vesivevebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fifty+shades+grey+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 20296 bytes
SHA-256: 2c06eec9d5e046cf6412d552fef1db24d3e47eb6bb3c416a825e94c778b3254d

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