PDF malware analysis — malicious · 8aa4d9f66e1b6db7

MALICIOUS

PDF

72.9 KB Created: 2021-08-30 03:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: df5d955e72f908cf138ff965ae2dd499 SHA-1: 1289d14a91ec3778431364380f52c249fddaefe1 SHA-256: 8aa4d9f66e1b6db75195f38e03ed405120d4a28436ffa75a7f690b898bf2c844

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link firing confirm the redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

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://radio6deenero.com/uploaded/files/lofusezumazafaxo.pdf In PDF document text
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f930160a2---26972260270.pdfIn PDF document text
- http://chickendaylacrescenta.com/uploads/files/kakiwudumewuf.pdfIn PDF document text
- http://robedecreateur.com/img/files/88958619428.pdfIn PDF document text
- https://electrabicycles.pl/app/webroot/uploads/file/16221907785661.pdfIn PDF document text
- http://daglichtfilters.nl/ckfinder/userfiles/files/47458734934.pdfIn PDF document text
- http://www.maderas-navarro.com/ckfinder/userfiles/files/10706746853.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78b52ae27a---10927531371.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6605a0608f94a0f408990fb89f45d828/76793223064.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5d72f86---32104184366.pdfIn PDF document text
- http://mkconline.com/landmark/ckfinder/userfiles/files/71070426005.pdfIn PDF document text
- http://xn--4k0b43gkwo4gn.com/upload/editor/file/64773753751.pdfIn PDF document text
- http://computergramm.com/userfiles/file/tidelisaregatarugenoziz.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073054dc7608---poxina.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7a5ae7045---bubebulepomuwigubozofiri.pdfIn PDF document text
- http://townofwinslowin.com/flash/townofwinslowin.com/file/63464303619.pdfIn PDF document text
- http://nigerseedindia.com/uploads/11513402438.pdfIn PDF document text
- https://denizlihorozu.com/resimler/files/tafanilisute.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a94fd6fd2---15446485530.pdfIn PDF document text
- https://ijtm.in/userfiles/file/nolepomufowakuxirifefoze.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da06f20601---luxobiletijonubomunekiro.pdfIn PDF document text
- http://ihdbd.org/upload/files/73015254559.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e3fcb1f6---81094499417.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/29c389c77580b16d73c2885e5147a309/sigetudepalena.pdfIn PDF document text
- http://westernstudioservice.com/admin/userfiles/file/rovazasemukijaloneda.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a69fd6315d---fujujububizu.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb430f0c---94438235928.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lying+in+statePDF 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_off0000bc92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC92	10088 bytes
SHA-256: `d09877424b070de7efb80300ed499268f7a6ac5a80be738098b6d4892e47c58a`
`font_01_sfnt_off0000d32c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD32C	17372 bytes
SHA-256: `63cf8d4bd0a0cf154f36e1ddfa8e8c47f3bece4f99de0972a9c9857487a2f853`
`font_02_sfnt_off0000fe18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE18	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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