PDF malware analysis — malicious · ae40c6bde840dc5b

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 08:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7ca77320484a2677499598c7c7af8732 SHA-1: 690a80ca94a6abadb7548f5a60091d1e2fa6a641 SHA-256: ae40c6bde840dc5bbd94581f241392a52dbcc8c11b9c2c47062f7aed5b62d5f1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress sites, suggesting it's used to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules detect PDFs designed for SEO manipulation and hosting malicious files on compromised infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fa97723c---puzobalizenigera.pdf In PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f539c1101b6d91436c76006b4796ced5/45062149785.pdfIn PDF document text
- http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/wabariwusosemutixikob.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/244a2b0f9768a1e96de10bbbaec7b987/6878399025.pdfIn PDF document text
- http://kosmonautika.ee/ckfinder/userfiles/files/jasimemawuguvatelulufido.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e1578440920b91c560ae07640e56111/pepekutijiwamiduteli.pdfIn PDF document text
- http://indianspringhomes.net/userfiles/files/52548352537.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c749105b5a---vafubunofadugixalawaw.pdfIn PDF document text
- https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gc5lbvbi70f1dqi4pd5mgaalc2/23746273262.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987174ad1a4---xelixizapalirux.pdfIn PDF document text
- https://egca.fr/userfiles/file/8123826592.pdfIn PDF document text
- http://budohurtsa.pl/userfiles/file/91389066513.pdfIn PDF document text
- https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/31d522333f56bcb0341649298616f607/12769297524.pdfIn PDF document text
- http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/69288183456.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092be7f2ec54---27977392122.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160902205dc2cd---wisomig.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a02964cc466---rosejejurajup.pdfIn PDF document text
- http://naucseto.cz/storage/77395910016.pdfIn PDF document text
- https://nbcmedia.vn/ckfinder/userfiles/files/wuxudukuvawipakidivava.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1e31369a---sexeninomawisejimikow.pdfIn PDF document text
- http://mamtomchabahai.com/uploads/files/files/24303234637.pdfIn PDF document text
- https://langestrand.se/anvandarbilder/204/files/26519117632.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/mojebonelojuj.pdfIn PDF document text
- http://naturallabs.de/userfiles/file/61142168920.pdfIn PDF document text
- http://szkolaprzybranowo.pl/ckfinder/userfiles/files/fovumuzazorewetidapuz.pdfIn PDF document text
- https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6423a3744---nazizugobupajugujolowezit.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+game+in+play+storePDF 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
`stream_003_off00010709.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x10709	17656 bytes
SHA-256: `32cbd52951adce27d0ff955d9b4319877717d17bc2f09e4f7882c5cf5b638d10`
`font_00_sfnt_off0000ee1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE1B	10800 bytes
SHA-256: `3c3fbeb6a00bd9aa92132e12535dc24ae755d39a00bd114fdef18cf29e9befe1`
`font_02_sfnt_off00013548.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13548	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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