Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5d6572ed1435ea…

MALICIOUS

PDF

63.8 KB Created: 2021-09-07 23:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6a564ed33a52dfab89727af7fffefe48 SHA-1: af10c90636c7688132111b260a9b6545d7a37c7d SHA-256: 1b5d6572ed1435ea4c03456e8691866722403937cbe9672695b5fbabcfefd186
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098a94b59ec8---74770052078.pdf In PDF document text
    • http://giustizianuova.it/userfiles/file/10060825460.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f3u7vfma0eg4c2810i20lsqbi7/dilomebujibivosewera.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ae43a80cf0dc3cc1871e7189115e9653/12734761703.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/50ntuou9r9a1hso3tg040qq6m7/44952001797.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/gobogifomejatuvezu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/27a1re5r1l9smo7nbh75vkqog4/52839767587.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/17390569962.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/bedilizovikilomelovo.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ruv6dgegcajap1do3rp3jm239p/xigakaporobataj.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6mun35r11q112ccl7g1jlr7u28/toreguwil.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a257d827949---rofafopufujawe.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/51243249421.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ce858a88f845fa48190c0e6da4bd9ec/gerut.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/monojekebugure.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/446637536.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/lulogadakujomew.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/setidemuvojozejepelebi.pdfIn PDF document text
    • http://rjt1.org/upload/files/gomafigoxakaxag.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/32495826367.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/muduxixoladodo.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/75627083339.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/tatabopebazona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=microbial+diversity+pdf+pptPDF 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_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 10824 bytes
SHA-256: 3b3880ca4f93de5614882132262c91a7fd0eef57a3395b3940259bc01edcce30
font_01_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1