Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c8fe1d9095ac83…

MALICIOUS

PDF

62.3 KB Created: 2021-09-17 08:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2aa16ed50c9dc9b6e0cb82fd036ca39e SHA-1: 3b21b42e173a10de80a6b175c6e4347d2e2305ec SHA-256: a3c8fe1d9095ac833ab0cfd729eed43fd302f79371b36d66818e1606fefc31d0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

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://clubslotalmatriche.com/calcas/file/luvirawepawofebulirekulep.pdf In PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/47172697086.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/65818830093.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/momotegoniker.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/44669984857.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/72407717050.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/xitajitamato.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba3d44688---55345015523.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/48596694738.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lejimexuturotexesadiw.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xuxotoguguwanulegirezub.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/nategabarasuliroribupa.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/subosuretoburovonuf.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/50821849440.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/5231734099.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/032313533278.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/49593997421.pdfIn PDF document text
    • https://uangraja.com/contents/files/mukogipevaxosokafisolora.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/89396509670.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ked3300348i4aidp2aho4n1d8u/palevubugenajuxiwawe.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6c6aa512ae7b64ea7ceb4227d4f1d0f9/87658096963.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/lojomuxoxodibojoj.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/37223961281.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/4133459600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+ultimate+guide+to+ielts+writing+by+parthesh+thakkar+pdf+free+downloadPDF 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_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 11440 bytes
SHA-256: 19ba2b378c6f27a2431109f9653267483c4b987235d6894366be73c1c122d41c

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