Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de4a6ebe4b407dc…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 10:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 616d6bc1b665d12dad44f3a05beb3a12 SHA-1: ebed403b39871b94a68c18ff866d854655b0e8f9 SHA-256: 3de4a6ebe4b407dc1160d72f309daa1e286951da87f45fcdbd12f21a06f4a297
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7354

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://dalnoboy.org/data/filestorage/upload/files/kidobokipofowiwipinesogu.pdf In PDF document text
    • http://mtecommerce.it/public/news/file/kitoxawimugudaduwalug.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2hr539uf99a16lpmo22o8rhfj2/robuve.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/05eed66d738d5528e7dd6361567ebb99/90934544533.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7a60a71f---repixadi.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/faxuloz.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fimarigujosipojuzisatozot.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/baxiremupusejimigo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/lefozepagodaxog.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081ab14e9c---2737345065.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sa26krhmbl5ehdrr81gi6461h7/54862103967.pdfIn PDF document text
    • http://esejsc.com/upload/files/6238193217.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/38003779210.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/21735119513.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/61b4758aeb83d1fc1666270cd1951cab/nidirubuvuwoxefakulif.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0aa76e3db3f223889008b739db4e1a6b/90527195614.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb279d6cf29---lixapune.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb0f397c---xoviwufop.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/mozufijom.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rn9kg70e6ujmhekpqt8guj5qul/61945946817.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/695f648b60051d1039e1b2fefee3baa7/supur.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g8kjs1uasbm5jtnj5snmveuu3q/95201387403.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a5fhonva2cc7m6e6hl3qg0n65p/basubibitunubopuraful.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11b3a93b2544e3b8c31373a49818e583/69242249410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chuy%E1%BB%83n+t%E1%BB%AB+file+pdf+sang+word+mi%E1%BB%85n+ph%C3%ADPDF 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_off0000d14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14D 25676 bytes
SHA-256: f7c91654952a056e707a9ba3d3d15cd26d7592818a25fd73dff02cb740145243