PDF malware analysis — malicious · 994a25d84385524c

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 08:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dae67c2a767ca41120a04f49e64bbde3 SHA-1: a3da397bfb008f2c11b19a55546dd840fd0f78ab SHA-256: 994a25d84385524c129111b47deb2df4e902109c82eed15fe4bcf7c6e046271e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these links for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 7

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.
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 https://chcial.ru/uplcv?utm_term=an+example+of+primary+cell+is PDF link annotation
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/042df89d8dcc2f298d65093b7f694b19/riwojasodipavosukixilidu.pdfIn PDF document text
- http://www.tamtrebinhminh.com/public/files/vujidobalazulisesewosag.pdfIn PDF document text
- http://ge-mak.com/files/xufunujesovimun.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vqk45i25q3sin6g5a3vvmu8sd1/josezuvijobewimoximoz.pdfIn PDF document text
- http://soluzionebenessere.eu/userfiles/files/woxipezawegawufajamofone.pdfIn PDF document text
- http://thaimassageboy.com/ckfinder/userfiles/files/zefabosigobiw.pdfIn PDF document text
- https://shevian.com/images/file/tufefoduvosuwezimez.pdfIn PDF document text
- https://motoquadro.de/userfiles/file/72339433618.pdfIn PDF document text
- https://netron.pt/app/webroot/media/files/40486225811.pdfIn PDF document text
- http://ideatity.com/ckfinder/userfiles/files/loregotogosepa.pdfIn PDF document text
- http://cathyourhair.nl/js/ckfinder/userfiles/files/96061427100.pdfIn PDF document text
- https://kvzriu.org/images/file/14936742188.pdfIn PDF document text
- https://euchebnici.com/img/file/naxebusinevigafibitox.pdfIn PDF document text
- http://vrajacreation.com/uploaded_files/userfiles/files/bozarolirizuw.pdfIn PDF document text
- https://copacndg.com/images/uploads/files/85600424124.pdfIn PDF document text
- http://gesundezellen.de/neu/userfiles/file/28377991966.pdfIn PDF document text
- http://tbvshungviet.com/upload/files/25664160363.pdfIn PDF document text
- http://creaorganization.com/depo/sayfaresim/file/kokid.pdfIn PDF document text
- http://camelliafb.com/uploads/files/202109031527471439.pdfIn PDF document text
- https://tagoproperties.com/ckfinder/userfiles/files/bezabuvumopizupex.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19d654b67---kamafadisafokaxatesim.pdfIn PDF document text
- http://matrix-corporation.com/upfiles/editor/files/vawawepuwepuze.pdfIn PDF document text
- http://cheliabinsk.realxenon.ru/uploads/files/vuvuniwotifiruxazifudun.pdfIn PDF document text
- http://cdkuysuujk.handysociality.com/upload/files/7430116875.pdfIn PDF document text
- 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_off0000b6d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6D7	10740 bytes
SHA-256: `766931a0e4ddcc71b9adee664d8d67fdadac8dff5fdf48dac069e4017ccd3ee4`
`font_01_sfnt_off0000cf88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF88	15456 bytes
SHA-256: `d64295d9d517706be4666a28c759f002ab39f97cda1c9dfaa25fb663738bf756`
`font_02_sfnt_off0000f69e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF69E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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