Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a3d4b1a4814046…

MALICIOUS

PDF

102.7 KB Created: 2021-09-03 07:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd42e18a06e604f67384ac250deb725b SHA-1: 2120f15236a1dc7058a9f26ac27249145a27a869 SHA-256: 52a3d4b1a481404619c7346ed9aa419f10372ac4e2597bb8819ca4e346593435
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to host malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on compromised CMS uploads and disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5883

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97e7cdc5c---87173348733.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907e31d71dc---givubirik.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161036fed9eb18---bimafunufokaju.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zulubonuvakure.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073df94cd779---tawekofopitusaja.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210505080624144.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607279d3d60bf---64345403514.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/33093736787.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608444d794570---mulifiweximokonotozum.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce8i18meibdmp4um41795rfru1/34545124341.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160744868d2f95---86598527744.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0346579e---bodapelotidexemuga.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/pirurevasogigo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755d20ee6a5---57568331321.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/19834266996.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb4899c0e---70145196071.pdfIn PDF document text
    • http://staropolski.net/Upload/file/41623792708.pdfIn PDF document text
    • http://cityfate.com/files/files/10673687748.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531175404.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/10730611839.pdfIn PDF document text
    • http://abc-tel.ru/data/File/92950547656.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/xapave.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/38855288373.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/nazimofizuweragutub.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/558f67d1ee057f2da2d92b8311e59ef4/senive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sewage+treatment+plant+design+pdf+philippinesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD4 18228 bytes
SHA-256: 734b7ff504ed51623277845c3dc3c66227c97dc8a5890e36299c42323d631ef9