PDF malware analysis — malicious · 83c6e14174cbb0ff

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 12:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 3a73c66db4d245e9cba1ba559757bd09 SHA-1: c823af22a402b2eab694f460999e5f7c18e1a38d SHA-256: 83c6e14174cbb0ff4952b06ee297b0ed84160b37632ecbb2d9d5fd5efe71cd5f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised websites that likely host further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://bushregenerators.com/userfiles/files/99296443623.pdf In PDF document text
- http://investgeorgia.ge/userfiles/file/44470136755.pdfIn PDF document text
- http://tageedesign.com/ssmpt/documents/file/75185734423.pdfIn PDF document text
- http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6e8c01af---2943296519.pdfIn PDF document text
- http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/703034294d56fac355c6bd3fd5950d66/dazukodikonunole.pdfIn PDF document text
- https://jocafoto.com/fotos/file/tulapiwapufenimibebizilir.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9ba8e40fca12c9d60f013c7089c01830/gutewabigotoluw.pdfIn PDF document text
- http://progettarecasa.com/userfiles/files/908033327.pdfIn PDF document text
- http://gonvvama.net/filespath/files/20210902113332.pdfIn PDF document text
- https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/dametaleduwodusofumateju.pdfIn PDF document text
- http://monikaknoblochova.com/userfiles/file/vabisotuxudixanakesunerul.pdfIn PDF document text
- https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vixatexogepawu.pdfIn PDF document text
- http://zeroseistudio.eu/userfiles/files/79526194318.pdfIn PDF document text
- http://yanarfabrics.com/firma/files/zebesunakakolejipesezaj.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377324bc9d5---xanulubirodowulorudej.pdfIn PDF document text
- http://csc025.com/userfiles/file/20210906014908_85xd5l.pdfIn PDF document text
- https://terracetemayonetim.com/upload/ckfinder/files/kiroxewegiwixijiwukozu.pdfIn PDF document text
- https://gtselect.fr/ckfinder/userfiles/files/lulejevamefudidema.pdfIn PDF document text
- http://ternovykh.ru/content/file/buwosepokogowe.pdfIn PDF document text
- http://kashima.cc/userfiles/file/33150236073.pdfIn PDF document text
- http://cherryontop.pl/upload/fotki/file/dikodomeboverujijiberal.pdfIn PDF document text
- http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28184503751.pdfIn PDF document text
- http://tmacfashion.com/ckfinder/userfiles/files/puwijojewadejepapo.pdfIn PDF document text
- https://biblioteka-koneck.pl/ckfinder/userfiles/files/71943487020.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=voice+reader+app+for+androidPDF 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_off0000ddee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDEE	18232 bytes
SHA-256: `73c6ed4d4566af139fb05307e44e7a26822038606cdd2da914ffe204d26f5d7a`
`font_01_sfnt_off00010d0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D0B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012522.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12522	10268 bytes
SHA-256: `6bf0a2b0eed3880267c06b048da38821222ffdcc3965c58f2d338fbf2236af20`

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