PDF malware analysis — malicious · d200dfd075a7adef

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 22:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 43e987cf72049a2c1ab9aaeddbf821c7 SHA-1: 82709db57594040fc74f66297fbd0003540248b7 SHA-256: d200dfd075a7adefd8f36190533ba4251bdecc35299326e0503dd56c8d3c49ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab059b991---47866729814.pdf In PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ft6fd6qvci36k591i7alspg6u4/62659698915.pdfIn PDF document text
- http://kjphotocon.org/data/userfiles/files/69820050801.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/c0101abaa946da71797c9367bd175a09/pubaje.pdfIn PDF document text
- https://schachverein-marchhoefe.ch/fcsr/news/upload/file/xekapexofefa.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f36bf9e6ed3---toxazozob.pdfIn PDF document text
- https://bselink.com/userfiles/file/fetiwu.pdfIn PDF document text
- http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607503a9c5e67---36394599462.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093069020757---40158769318.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884b4b05d39---46173202149.pdfIn PDF document text
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/1c9dd471ff77502e00ebd05e7d4b75a9/423265037.pdfIn PDF document text
- http://modaxch.com/userfiles/files/pefaluvuroji.pdfIn PDF document text
- http://candientu24h.vn/webroot/img/files/latijoziwovopekesepetoxe.pdfIn PDF document text
- http://robwalker.net/fckupload/file/vidopezaditevusuvoter.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f34206d7a---57577289781.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609107f818e1e---2729785206.pdfIn PDF document text
- http://kahounova.cz/userfiles/file/lovilotebewifodurilavog.pdfIn PDF document text
- https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/970d79047be723614ad8dc3c905db686/pewajoxokorasumi.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/vaferidozilubomosod.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0t4e8f46gm3ipno0ops05g6grc/57045930260.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0012964abb---masavosinaruzuxevop.pdfIn PDF document text
- https://vienhung.com/webroot/img/files/nuwaramevovapapoti.pdfIn PDF document text
- https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/10cf3b6ea7587fbe32eacb7a27645e71/29091303978.pdfIn PDF document text
- http://5percent-design-action.com/upload/users/files/33796801035.pdfIn PDF document text
- https://dafelia.com/files/rojuseleduxorovegibike.pdfIn PDF document text
- https://highrise.pl/file/delavifubifovilapusa.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lipids+biology+pdfPDF 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_off0000d4c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4C9	10288 bytes
SHA-256: `53aa4d1c0b021468d52529b594aee1a0df167fb4c6a65ca76474ca920afec0ea`
`font_01_sfnt_off0000eb87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010399.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10399	17116 bytes
SHA-256: `77ef20fe645abf103882ff450e901a29aea2ad8c4f4a4922d03f38a860d312ad`

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