Malicious PDF — malware analysis report

Static analysis result for SHA-256 3536845835144a50…

MALICIOUS

PDF

67.9 KB Created: 2021-09-16 08:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7f2ed556b520e6863a1966ae6cd7ca4 SHA-1: e3373a80c1419165311752de9e1a08652c2d4fc9 SHA-256: 3536845835144a505f3afe4091cc4f24c1f591fc3ea04b8c202d2bbf5a5048c3
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm and was detected as malicious by ClamAV and an ML classifier. The document body is heavily obfuscated, but the presence of numerous external URIs, including those hosted on compromised CMS uploads and disposable domains, strongly suggests a phishing or malware distribution attempt. The specific URL `https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=photoshop+2020+crack+mac+big+sur` indicates a potential lure related to software cracks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9108

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://emotionpicturesfestival.gr/userfiles/file/likazisako.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedf2999b7---fidamozomoj.pdfIn PDF document text
    • http://teraval.cz/res/file/nenikip.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mugekujilidi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/369dctq3b2omop5k6e1rpaelbh/mukizubanidoxubibuviwon.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/76057847414.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/71957673361.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kakokosetilosafatalir.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/voxido.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/zunapedebena.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/tajaxosesaxotitudafokokim.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/ruweworivofitetoluma.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/47186628739.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/reduxefa.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/sudowupobarisulaxipapi.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613fd9b46f21d.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/35101693568.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/kedajofobusalumuma.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/41844435162.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/a6124a84d2faad157d19dfa4ffd372e9.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021461832.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e4fc7e6c3de22aad81a8cdb5a1b3e8aa/60469646552.pdfIn PDF document text
    • https://harom.ro/files/file/81301294746.pdfIn PDF document text
    • https://kaparatt.com/images/File/15428593188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=photoshop+2020+crack+mac+big+surPDF 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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 18076 bytes
SHA-256: 0086b98e5b4e2f052748fc629b1d8cfc43f3e51a5fee62372475f1d7a60c1889

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