Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d688c93c0eb3efb…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 10:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d78297c46b49a63130165559a2716b06 SHA-1: b770f1ec02b8fa4c08a660cfb083a4f672b2069b SHA-256: 1d688c93c0eb3efb5978413a3ab8ceaa621b05ac4d0f84d9135ce58c3a3ae2f1
154 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9143

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 https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9866ab5cad397c65580c022b119ee7d6/48470001239.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983404e4ca5---miguwulix.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f87c53b40---83913439057.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/dirajet.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/dadaxona.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///6034544939.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/98904153755.pdfIn PDF document text
    • http://chayka-svg.ru/files/merimamuk.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210715/file/93449279627.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759597e264e---konetofezawonexajosukimi.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/veregowuzulan.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612373b301587---vufotonib.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/lexefokoj.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082c11436e21---70538664056.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e1e5d23e---55667127945.pdfIn PDF document text
    • http://innotack.com/userfiles/files/66817859814.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/nokajupej.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/lumeterexiregorabik.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608472a2e4aeb---pigogujotekuxirulox.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/jedugoweluzivo.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/josavozaferidumedarab.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7b9122b3---kakenelatorafaxax.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/panosiwironivepalujow.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986c014acbf---detebigadatib.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09e89c9ab---53092027392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+delete+my+outlook+data+filePDF 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_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 18128 bytes
SHA-256: 2e3f5347ad06a7ff8ade053c89319d49f58cb0e61db25d7fb5c12e04dcf98ba6
font_01_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 10528 bytes
SHA-256: da7e432c6c18f64feee70269a4e903ef99ce6ac0055faa92bacb8a41bce4610f