Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c897551f72e69d…

MALICIOUS

PDF

94.3 KB Created: 2021-09-21 16:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37ce78ffd6f763ceef03c786e5939654 SHA-1: fc8da26c77d038eabf085667a4d2c83f7aa363e6 SHA-256: f4c897551f72e69d4bc82ffb60361beadc49c31ad2d7529f1b94bead387a5e28
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

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://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/74424675708.pdf In PDF document text
    • https://mimpishio1.com/contents/files/76326582431.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/fudirowebarul.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/22853567844.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/18238747537.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/dilozalupipariwu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0ff5028e49774619cf300113638334cc/mugomedibun.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/fotivaji.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/wajegatuvokama.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/93658992752.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448055b486a---zujejufilasufoxupi.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/85390544064.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/5722150435.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87886499932.pdfIn PDF document text
    • https://gulamanis.com/contents/files/gadokedipovotuzipu.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/tanulabidezufeve.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/73943463492.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/72129862023.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/xuvipinizof.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/bosuwomisoxafikakudiro.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/32255472918.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/falexivexifojuf.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141dc52aa842---93915809541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=action+verbs+that+start+with+hPDF 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_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 17412 bytes
SHA-256: 730dbe74af27d6fed0663f146fa21a37c398e52f82c07980cb6bc9756d362097

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