PDF malware analysis — malicious · 96eaa105893b019c

MALICIOUS

PDF

90.5 KB Created: 2021-07-13 22:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 420c8d65170934e4fc40aa740f98c322 SHA-1: d85f951359633cfa5633cce210e45ee539ba3cdd SHA-256: 96eaa105893b019cc961bf660755e01cc44d2993be8a337723381d751b1483cf

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate that the PDF links to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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 https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160975f547dcac---tetozanijebaf.pdf In PDF document text
- https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b91e62a7215---bifaxijelonojozunefizolus.pdfIn PDF document text
- https://takipcisec.com/calisma2/files/uploads/fenadik.pdfIn PDF document text
- http://moveworldtogether.com/datas/files/94844653107.pdfIn PDF document text
- https://dolaodong.com/userfiles/file/fakilutitofunoripabifog.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfc67189d---tesekagemet.pdfIn PDF document text
- https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/b7gm0qj970qhr3u7bkdnne5a8b/1893824655.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcb88676a---kameligeniwaf.pdfIn PDF document text
- http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/b0arcobbv24vo4rftngf7l5ro2/29413060394.pdfIn PDF document text
- http://hourinkan.net/js/upload/files/fawexirekukelopinuwajepu.pdfIn PDF document text
- http://nuestratierrapremios.com/campannas/file/4718544824.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d70e03f1---215314424.pdfIn PDF document text
- http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/39967970007.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b603dda45b9---gigamuzumobapalaso.pdfIn PDF document text
- https://weilaimachinery.com/userfiles/files/99047400544.pdfIn PDF document text
- http://polesprogettazioni.com/userfiles/files/vubumumuximovifulipa.pdfIn PDF document text
- http://kielcenoca.pl/files/file/40682096991.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/5fa8ee09d7bb9a7f155abb2ab22f1380/5829054376.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/puwube.pdfIn PDF document text
- https://akita-inu.lv/www/files/files/bopomenofidisesupewuk.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e168c49c99f---55959030004.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160808a52b816f---zexijigem.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dea8ea913---59583063821.pdfIn PDF document text
- http://cl-pub.com/files/files/dezokizozisejitili.pdfIn PDF document text
- http://luvnchrlysenglishtoys.com/clients/861429/File/sasisubagaji.pdfIn PDF document text
- https://bushregenerators.info/userfiles/files/sunexakuter.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b7b684683c18dd8f1fda3f6d61c58dae/21434088678.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=college+essays+that+workedPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0001014c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1014C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001195e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1195E	16520 bytes
SHA-256: `70375105b9360619b7a345f8769213b0bc5e64f1d05e7e0cb8df6d5ac5481516`
`font_02_sfnt_off000143ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x143CA	10656 bytes
SHA-256: `d4c2aae6194b47870a1bd3458caf3bb8088baf2924c31d724f09bf1e692d0d04`

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