Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6e1db3994a5c0f…

MALICIOUS

PDF

110.2 KB Created: 2021-07-02 10:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bd2ccdbf4b4347fce09f41251ef5a1cd SHA-1: eedbcd478aed352213226c54707ddc379913dbe9 SHA-256: 6e6e1db3994a5c0fb2a1b37e86dc0874ddb18bf4e59b5e740b051d4066ed5c21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dmhu.eu/uploads/uplib/file/91500372819.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/u48og7q5ees02pluafg0jskve2/52382181511.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5fbed2ada80db9921729f38953028efa/wogumusonevagezigix.pdfIn PDF document text
    • http://azizolace.cz/images/file/safitafavafafiwazedemuxo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0f6cb73d---13772573691.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/63248417104.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dcoec1nm03ck1vme6361erdif2/nuwuvalewiwexivi.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/54491301564.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160800a257734d---vetanamebukofifop.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167931f8c9---18315921586.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a226c10ce4---4587868901.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9ced637813d8190c0c05f48a5441c70b/gobavutu.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/tisukiliritekawonepedi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926d0b937fe.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/01cdac72800fb24f58e5e1728c7b0de3/37123421597.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774e306dd60---jadipisumojusanajopek.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088079f1c734---dubetoko.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/455347066095a4924bc89.pdfIn PDF document text
    • https://nevisnews.com/userfiles/88460369979.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87607ec1a1---bifojutomigavetudu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vebawoduli.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/someregeduxugupirowatoji.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/34293153005.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/juzijolefez.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a31837702---pawowuvifovataguvabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sims+4+fill+needs+cheat+code+xbox+onePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00014ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC6 17812 bytes
SHA-256: 55c921d274d5fbbee5430210bb0de92f883bcad0461bf3276296a79d42cf81f4
font_01_sfnt_off000179cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000191e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191E2 11036 bytes
SHA-256: 8492d10a59c9415f2a85f9b8ec6d5e0bcdcc02d0cfa33c4f429527b0cfa9b9c1