Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfa04f0954e7da2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 11:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f04a0a666cd018d57b3b26bb292bc55 SHA-1: 3a15bd76a058b8490e7a584c0166a4b0ba92043c SHA-256: 5bfa04f0954e7da2fa1d6a492a81545d1acb6b509c4ecf06f0e77fad72d6d558
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kingsbrite.com/kingsbrite.com/userfiles/file/92382495151.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/rekutovu.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3a79c2adacaff209bafd4e78bf8541ea/jefutoledim.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16072b273a0e07---65919723466.pdf
    • http://timandlor.com/userfiles/file/17963025361.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852a8c721c2---2498715675.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/3294388174.pdf
    • http://afslab.asia/upload/files/77967698838.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ac6a1629---lejidubeza.pdf
    • http://eraldocomo.it/userfiles/files/kosuliviremab.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/puxunokirudusewofamo.pdf
    • http://sgpeo.pl/users//file/mokimuwivimubowivenabogex.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d875174d03d---nubefaladi.pdf
    • http://arisutour.com/ckupload/files/21396521414.pdf
    • http://pagyesa.org/userfiles/file/20210623062014.pdf
    • http://ceramkgres.ru/userfiles/file/fixanaxurezefumudunijop.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/97516309621.pdf
    • https://sleepthai.com/piceditor/file/64343264397.pdf
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/92828846214.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610054b2d1c2c---85499054362.pdf
    • http://flywings.sk/UserFiles/file/39612691610.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a772fe6b0f---64268372552.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ccde45d6a1243238c1f78d59265aa4a7/36042177167.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160db8f8465993---nezep.pdf
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/xurodudafupovozitepipo.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037ec6e86b---59394626278.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tipitina+sheet+music+pdf
    • 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_off0000e395.bin
1d9f68e83d04b8f57e3bf98e5690a421e95aebf9e6db79c29553214f212ed6ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 17364 bytes
font_01_sfnt_off00011057.bin
63ce7f9d1131cd56cc2dbd655fd5c18820c04620b7bec7d6117ec2c2cf9cb3f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10684 bytes
font_02_sfnt_off000128ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16792 bytes