PDF malware analysis — malicious · 5722120dc39f70c9

MALICIOUS

PDF

91.7 KB Created: 2021-08-10 13:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ff64141366335bcdcd14a98c4192ad28 SHA-1: 54617df5a3f8be46af8b8af0d3bf31986df0250c SHA-256: 5722120dc39f70c9df31cd1226c20ad978ca5c4dd9a9979199ee7a05b5d3467d

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://brkvinc.com/userfiles/file/sawumuxadeli.pdf In PDF document text
- http://ambulanceservice.pl/userfiles/file/vojijeru.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb249a92cc---66674894609.pdfIn PDF document text
- http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/85732914724.pdfIn PDF document text
- https://gadd-asso.org/userfiles/file/25019186608.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c6c63674ab3f453ef67b25c83c534ee3/xizetujigukawo.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/53990256621.pdfIn PDF document text
- https://egyseg.eu/ckfinder/userfiles/files/gigomuwewovokita.pdfIn PDF document text
- http://ikuma-car.com/js/upload/files/wakozip.pdfIn PDF document text
- http://gemculture.com/userfiles/file/leteranuwokido.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hn90ondi8qln9s8lvc504a87bd/94445227678.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pgqgs72a1k3obp5i8o9vepootc/kanidufor.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rtsi5ltgoos9esfd6eirsgkrj2/dezup.pdfIn PDF document text
- https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6aa5f463f9c3aa339cefc245a00969a4/rusipokov.pdfIn PDF document text
- http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/el4nl6kv92nvh6g7rq77hc90mi/mugaxikusulovil.pdfIn PDF document text
- http://laweasy.kr/userfiles/file/50164001501.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/211b36176a55a17472e6c6fc54a44345/firubibiravo.pdfIn PDF document text
- http://schs1968.com/clients/861610/File/5388942170.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/48e4e6123d8c025a8900f79ec1de7945/2641714805.pdfIn PDF document text
- http://chuaphucluong.com/uploads/image/files/3602486683.pdfIn PDF document text
- http://jtylek.pl/Upload/file/luzusodozurunole.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+connect+chromecast+to+phone+internetPDF 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_off0000ff29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF29	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011740.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11740	10672 bytes
SHA-256: `1ebcecd089d9d71327f2ebd5824db85678594c4e069d33df4b3de04067c8a891`
`font_02_sfnt_off00012f81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F81	17968 bytes
SHA-256: `f23b66e26bdafc5ddeb3e6272bc09510077aede5c5fa334b8c68964af9533d4e`

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