Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5374cae531b048…

MALICIOUS

PDF

85.3 KB Created: 2021-07-24 01:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 31bf45ed0d1d293af3b80a124f68f928 SHA-1: e1cea351e7e3663a4170d1ad999b5a9015a44fae SHA-256: dc5374cae531b0489901a45494df9c574f9fb1977da965bee9e432f937f37fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9574

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dangkykinhdoanhkiengiang.com/upload/ck/files/jarasigixukofix.pdf In PDF document text
    • http://smn68.com/clients/75339/File/nerozonovokigedivi.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216151953468150.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/nomefa.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160efe28bbca23---23873312843.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/b496f5d9c5fabe394e83686078fd9767/kevofofiwex.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lvuntiu12291i9p7i139fbtp60/vujuwexefiw.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/29316044080.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b708745fe9c---puxoxojikozonuzigisof.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb454d9df---wuniliweb.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ac982415a---49805554134.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/66839480675.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/pegowexijedovovivaditeso.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1d4a14fc7---kobumeso.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/85044299402.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/7166548194.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db09443091a177984e4df37268c39746/silifijudefepajo.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/fatogaxekiremenagazix.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbac06e3b0---65022665298.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5n5v6kb7lnnhp14k8oj1srvhii/bofamiwefejutaj.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/9747848913.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/kmsehcei28kkuqpk5oeonibpp5/50283441500.pdfIn PDF document text
    • https://cargotavio.ru/files/file/nixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=business+model+thesis+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 10656 bytes
SHA-256: 6e44b2a018f986cac3916395ff7e1234ec05e259272e6509084ea2f407294f37
font_01_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16728 bytes
SHA-256: 43bb2fd7b6090c944170eeb2726f0394b725b7dafc11d0bef2253360ee4d5e22
font_02_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.