Malicious PDF — malware analysis report

Static analysis result for SHA-256 527b821eeb8f9ee7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 17:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7849dfc9f1c889b9247ccd532a3dd04c SHA-1: 4f880378a1979ca86e0dfb5bcd127429f1a5563e SHA-256: 527b821eeb8f9ee78df744e3bdd9a7c705d80985de93b102d63881b5d43f58b1
124 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 websites or link farms designed to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The presence of link farm heuristics and compromised CMS uploads indicates a pattern of using deceptive links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2993

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 http://sdds.be/userfiles/file/webifukuvexe.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/mavinagekiwekidivoxageva.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/175e2c096856aa6df6d84abf909d65c1/94855048771.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/24520397050.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ed46d9cd91d76047b14b63a67aa4f072/95667556729.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/gumaru.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/wafumizawinu.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/ragowopumigozojotel.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/48608697361.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/lubilazisutefamikupelif.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/14146873840.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/m1hedkmnc1ejv16polab901m34/28329896590.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/40408801908.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/78176855831.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/50943066286.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/59409349751.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/86498967749.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/bizanoronitakele.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/62724972166.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16169879471.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/suximogaxewum.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/90518584053.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e84cf354---93969193698.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/wojilikutupebuzavusa.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/vudafapabudesume.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea578c2440---58551863565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=causative+verbs+exercises+pdfPDF link annotation
    • 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 19044 bytes
SHA-256: 8f74f4c3f69633c62801e6f8a90acab380c912ed608e18e721673619555c4077
font_01_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 10780 bytes
SHA-256: 455d65a307d143ba9cab6447a7fa54e84d764c2a8a37c6e3081fadf576d97aa2