Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d8067701518305…

MALICIOUS

PDF

94.6 KB Created: 2021-09-20 00:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19c5a528848ba6ae5b47d464f3da6caa SHA-1: 9b2e0bbd1dc44a464079e10dea02273630fa104b SHA-256: 86d80677015183055c1e600a66726d9bf209ced12baa3cc6457c617bde02e829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs are designed to lead users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalegefojabazixowunavilo.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573058a758---tobexawituzevi.pdf
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/badawewatisixavi.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/34f81ebb3983e01d19a27da100118165/vatepotidubevenore.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/42597257875.pdf
    • https://mtestbd.com/assets/uploads/files/15594091805.pdf
    • https://simorgh.it/uploads/file/dogewavutama.pdf
    • http://donghozibistore.com/luutru/files/rivukot.pdf
    • http://balletpanov.com/uploads/files/54160837457.pdf
    • http://studiogiovannone.com/userfiles/files/79519143342.pdf
    • http://gocoachfox.com/userfiles/file/gadap.pdf
    • https://vildmarksjagt.dk/userfiles/file/74360479501.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f88eba64---tatukazimatavamewazoroko.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa669b7128---10945939880.pdf
    • https://sieuthimaytinhcu.vn/upload/files/mijugabagaporidat.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/81574140152.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6bacd3092599d09afa8ce2d4b8252985/vigarejonivuzaluzeg.pdf
    • http://gerd-pollak.de/userfiles/file/vutifizitexumekifos.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/dokomoxun.pdf
    • http://jinsonmetal.com/Upload/file/31023551342.pdf
    • http://bagiez.de/userfiles/file/58167343455.pdf
    • https://phnews.ro/files/file/21126087393.pdf
    • http://moriefrusca.com/userfiles/files/zizanepewawepo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=website+that+translates+pictures
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b1d.bin
52f8b960de08ee4e93997d73c951343f4a2f344d0dcdec285001dd5af27e1978
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 19052 bytes
font_01_sfnt_off00013cd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD1 16792 bytes
font_02_sfnt_off000154e8.bin
18e9bcbc3894b537df4a3959d5b6994ffecd0f399abaf583072504db9b7503ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x154E8 10584 bytes