PDF malware analysis — malicious · da44598179e89843

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 08:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: e2294a17bd6fc73e78cee5d5ac28bcba SHA-1: 12d1ce32937423c4d0cba1a9f2dfe5d64a2f3890 SHA-256: da44598179e89843963223694bd8e78d382052c80953c658263aee4dfd9c77b9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

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://suadienlanhhanoi.net/upload/files/80674468331.pdf In PDF document text
- http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0d5a27c0eb71344cb6d9973ea451d2f8/laxigumadudakapaxev.pdfIn PDF document text
- https://samarpanbharat.org/trila/userfiles/file/2602732480.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071144f60f33---nosikagiv.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972fb8c0a3---25609166257.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/87874339186.pdfIn PDF document text
- http://vksraja.in/fckeditor/upload/file/fevexibelojogaligunet.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/fer1k12hr2bq1setpods9p5dr7/76664230733.pdfIn PDF document text
- http://icltindia.in/userfiles/file/95272176732.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716d1273e8b---41996889519.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28deb8f734---digani.pdfIn PDF document text
- http://srtprogetti.eu/userfiles/files/67829388337.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160812eae3c524---95119091999.pdfIn PDF document text
- http://skkl.cn/filespath/files/20210830022520.pdfIn PDF document text
- http://www.aportecnica.com/imagenes/editor/file/66994112924.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/28e3e61a4b45a120140cce97b92a737b/tatinuxeruresubajovuvaxi.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096bdce6af03---42245490381.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/490272b8495ae4ff71ded1a2bda3f33c/7512313059.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/kokelugoba.pdfIn PDF document text
- http://terwaarde.be/ckfinder/userfiles/files/79913768928.pdfIn PDF document text
- http://brilsports.ro/userfiles/file///31911590027.pdfIn PDF document text
- https://farmaciasacoor.com/site/upload/file/libomobuki.pdfIn PDF document text
- http://ip-malkov.ru/uploads/files/48865780966.pdfIn PDF document text
- http://uran-berlin.com/userfiles/file/41192014370.pdfIn PDF document text
- http://geonatlife.es/ckfinder/userfiles/files/8099804706.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=moong+dal+in+telugu+meaningPDF 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_off0000be0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE0A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d621.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD621	10416 bytes
SHA-256: `946c28ae2092aa7e5e2de78ca05f9ad3c4546110a455fa43832adb3b60d36385`
`font_02_sfnt_off0000ed74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED74	16116 bytes
SHA-256: `e0c542b45d2793e10c89c2995605dae47c826bde55d8c87b8efc1d09b4917abd`

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