Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33c890b705c380a…

MALICIOUS

PDF

92.6 KB Created: 2021-08-01 11:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a772ae0fcbc782284c3813e13c2fc73 SHA-1: 752edbc389bb51528a661c9513b05c0ef2dcaee9 SHA-256: e33c890b705c380a6d183b6c74a5e5f8ccb3c0e77cbf66c02e53d4b7a2dfa08a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of these links, particularly those hosted on disposable domains and utilizing formcraft plugins, strongly indicates an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3908f36d---2553439778.pdf In PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fibav.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/662pl1r3t3a1n1rb4m6s8ttrd5/navexabagukinokep.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff3826d26---wadifonuvekovujoduso.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5b12a0ce---27047618023.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/21430cc05601fc9458d912be196bdc25/37799676397.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062804523573499.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/44460312210.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/tegug.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa41e2621f---8647669583.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/crkq2ceqb4f87rlev13qf78cu3/dodemugos.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/47031934008.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sulagefevasew.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/jomawadu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/794c8516d5315771ab67cac18904ad97/zatotevesir.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mijapamutetezugodejeke.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca6a2fab1---40331161298.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7681265d5---83095124151.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/921a7d25ed912acd4360c8d4b7eb12dd/54629145468.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d2ce0aa6b---kinugusukerapukis.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1ehuubruofajcl7veifinr4hpi/20410743237.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/kepexazixagadam.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/nowozagotavedifuwig.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/75073670391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+money+cheats+story+mode+xbox+onePDF 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_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 17512 bytes
SHA-256: 0d9b6c36f579e592e977040f49f227bbec7a8d6838a6355fccc72ddcc451688e
font_02_sfnt_off000152f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F7 11028 bytes
SHA-256: 0c2792b49dffa9e19903afb692a5a2c87ac98854163a371dddaaf103e55aa435

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