PDF malware analysis — malicious · c92e23b3267a633b

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 10:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1703c3c2f7c697cb63f7f3f46582e4cc SHA-1: b146b5d2b0e639451cfb32936e06ee5c554dbfd9 SHA-256: c92e23b3267a633b988b3ccd446e5ef7bb11b4ef1fe3d11120f66494e266e610

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=christian+brothers+malayalam+movie+dvdrip+download PDF link annotation
- https://marblo.com/app/webroot/img/files/65237375611.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jv3g2pejqvclehno5i7nfmfjsg/91955683162.pdfIn PDF document text
- http://kantipursecurity.com/userfiles/file/61282157701.pdfIn PDF document text
- http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/83742431228.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6a2fa2a31109794daae181a473c9f6d4/ginevagarobeto.pdfIn PDF document text
- https://toyotaautobody.com/ckfinder/userfiles/files/nazukom.pdfIn PDF document text
- https://innovativallatgyogyszer.hu/fileok/file/83004928216.pdfIn PDF document text
- https://mtestbd.com/assets/uploads/files/torugenivadirewazedub.pdfIn PDF document text
- http://www.photonics-science.com/ckfinder/userfiles/files/85391268595.pdfIn PDF document text
- https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/3504772268.pdfIn PDF document text
- http://inphuduong.vn/upload/files/1058769916.pdfIn PDF document text
- https://ienter.bg/files/28015059445.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/19645921891.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161343a0e435be---waganovobebalavanujew.pdfIn PDF document text
- http://vzwsportenmuziek.com/content_docs/siziruratididetelito.pdfIn PDF document text
- http://naturabliskociebie.pl/userfiles/file/51463782442.pdfIn PDF document text
- http://insureavisitor.com/userfiles/file/87586218653.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27e70f351---vufegipimezowojemis.pdfIn PDF document text
- http://rucodelniza.ru/userfiles/file/loreje.pdfIn PDF document text
- http://reklama-v-sochi.com/ckfinder/userfiles/files/15284585902.pdfIn PDF document text
- http://posekatzahradu.cz/files/file/4867220558.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/80609182988.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161319fe859d55---89960903546.pdfIn PDF document text
- http://liebherr-tr.com/userfiles/file/zuwanikud.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_off0000ed52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED52	19004 bytes
SHA-256: `12e8427c87dad66e42d1a9885a64a67a066e4ec1bc981b8cffde30c5a24d6a58`
`font_01_sfnt_off00011f34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F34	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001374b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1374B	11096 bytes
SHA-256: `df340a8a9315e4306a98105713f1157fa6482e7b8de5a9ee0db0cbf1923ab9bb`

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