PDF malware analysis — malicious · cc16fe91063b058f

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 04:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d190fb350bcb7b2e913c8eea7b296750 SHA-1: 42bb5c4c0853e55baea2d9e599a3c27a6c5c60eb SHA-256: cc16fe91063b058f69e0d8d27e2358089e518889f7ab77753c2cbcc9f5b7c9db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its immediate user-facing purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be04de8c69---teterinagifegido.pdf In PDF document text
- http://www.terresdescaraibes.fr/file/18567910274.pdfIn PDF document text
- http://baheth24cars.com/ckfinder/userfiles/files/vopubawexo.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358a90e9b85---fimesevalebuge.pdfIn PDF document text
- http://whitedwarf.ru/public/images/ckfinder/files/naxajifa.pdfIn PDF document text
- http://fotocaroli.it/userfiles/files/witer.pdfIn PDF document text
- https://jancsoalapitvany.hu/ckfinder/userfiles/files/27726163244.pdfIn PDF document text
- http://bud-med.eu/userfiles/file/23181721644.pdfIn PDF document text
- http://mamaskitchenorder.com/uploads/files/xaxesigirevovofukezavinod.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252e6c2e69---36227869268.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0d245002b0e471e9718cf09e2971ebb4/4267044125.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/70485970877.pdfIn PDF document text
- http://www.morrisjones.co.uk/EditorImages/file/97527720149.pdfIn PDF document text
- http://chaukitchen.com/uploads/files/5134187050.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e1fd9cc3b---14799002654.pdfIn PDF document text
- http://aaykpn.com/uploads/editor/files/66863048956.pdfIn PDF document text
- http://tensoinox.com/userfiles/files/debizefom.pdfIn PDF document text
- http://urjabatteries.in/userfiles/file/botamedepulelibakinefiwun.pdfIn PDF document text
- https://satesayap.com/contents/files/ziwiwatidabedu.pdfIn PDF document text
- https://milosislandrooms.gr/userfiles/file/24478437161.pdfIn PDF document text
- http://szjwwj.com/userfiles/file///jipenajitedumufuja.pdfIn PDF document text
- http://chi-kara.net/userfiles/file/togevofam.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce5f2b7d9---sovotigun.pdfIn PDF document text
- http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/95571017982.pdfIn PDF document text
- http://gvs-russia.ru/admin/ckfinder/userfiles/files/fimoramumivabokututusoko.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=are+photos+permanently+deleted+on+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_off0000d764.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD764	10752 bytes
SHA-256: `f9708c24c02cb7dd54c6dc9daafdfdb28d83a7c172ff59ec83efc4d001dcc91b`
`font_01_sfnt_off0000eff6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010808.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10808	17536 bytes
SHA-256: `10d89ec42f30f16bc7d817e63a4de9b602ecb46e3377e035bfb72f6a5ea39213`

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