PDF malware analysis — malicious · 503eb677e595c2de

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 19:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d10abd479564f8df8fa026185bce36b4 SHA-1: a7c91d6a2ed20c56c4d71a8f0b34654b2f821359 SHA-256: 503eb677e595c2de5fab8d1c3484bfa6e044eb3571c585cb30c2aafd72697c56

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9896

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 https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c710ea24939---77520543207.pdf In PDF document text
- https://barcelonamedicalcenter.com/files/galeria/files/25732714530.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/konadajamazeximiwa.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843008ebdd7---80535683553.pdfIn PDF document text
- http://union.travel/ckfinder/userfiles/files/23117668630.pdfIn PDF document text
- https://mysilo.com/upload/ckfinder/files/defasiduxekagekawarerosek.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/17f9455e141882fa1c884713cdc97414/45637744768.pdfIn PDF document text
- https://villadorottya.hu/uploads/frontend/files/kimib.pdfIn PDF document text
- https://szabobuszberles.hu/files/files/tufagawasepalowukef.pdfIn PDF document text
- https://canionglobal.com/FCKeditor/file/25098526957.pdfIn PDF document text
- http://abwcoliseum.com/uploads/files/46068368699.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc228e8b37---42273786807.pdfIn PDF document text
- http://olympicburger1988.com/uploads/files/46249828652.pdfIn PDF document text
- http://rem-proekt.com/f/file/pafoburowakitexofix.pdfIn PDF document text
- https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390e7b191d---pokatewelidajujifivaf.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e08eaacc2---zibobivoza.pdfIn PDF document text
- https://bhsbeacon.com/FCKeditor/file/16979977247.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f781e33a---deduxisukejobatosobodus.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gb4jkd2lgr5ip5a4m9v3a72mer/talibu.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160828688d174c---59424936997.pdfIn PDF document text
- https://xn--pssa17sw71b.tw/upimages/files/zeneferigurupewa.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7c3272325---jewopumumopepakolikubox.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d5ahl89r9gj6rkloarlnc8shm0/68879649262.pdfIn PDF document text
- http://kurier48.pl/files/userfiles/file/sawemadijejilot.pdfIn PDF document text
- http://www.badischer-kunstverein.de/ckfinder/userfiles/files/47681695243.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1e9d9155ee630446ca9b67bef3a1e451/83929158967.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50715ef50---seloxos.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=anatomy+of+a+disappearancePDF 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_off0000ee88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE88	17084 bytes
SHA-256: `10dea491d8026cb00d861973d4ee58573f71fa61c83251635663b94df3cf289f`
`font_01_sfnt_off00011b1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B1A	10828 bytes
SHA-256: `6ecbc0bcc8a13d4338670d04a624ea00942beb4a289b82148aedf6e5a0e2d1e3`
`font_02_sfnt_off00013425.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13425	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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