PDF malware analysis — malicious · a8114a06329690bc

MALICIOUS

PDF

133.7 KB Created: 2021-07-19 21:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d27ceb5d6191a8b3095024e6cc92691a SHA-1: b570f56695ccc325c4b5caf330c4e7d2167fb9d5 SHA-256: a8114a06329690bc9a38f41d4878ce06cb8f6ef5c7ca516f507d8e2c002ab6cc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The document body is unreadable, but the heuristics and numerous URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9768

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://filtrydokoparek.pl/img/all/39105740084.pdf In PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dvk21btdt3u5pd5nc7sibdgkj7/jimetiviz.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa7909dbf---22231856795.pdfIn PDF document text
- http://cuahuyhoang.com/media/ftp/file/89889514174.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c237bc16d2---75627725712.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20a8b8fcf---86627704733.pdfIn PDF document text
- http://myredm.ru/uploads/file/90373700869.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63dd9b4987---foluzutaluzewadamov.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fbd5e3c9---83835761459.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8563b50db5a52694b67cf6c495551f5d/favuxujodijeruvetuwo.pdfIn PDF document text
- http://big-blue-bus.com/pics/fotos/1/file/jefawipu.pdfIn PDF document text
- http://qunjl.com/userfiles/files/kemigifikabawefij.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1hr8iceci6fc7666v55f0seoa5/potakokosebafaginikuvomu.pdfIn PDF document text
- http://sva-jeanroze.com/xmedia/file/zumezewatofisaje.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/10e81m1t9v4dsiv2o9e4m8v0f9/82531357093.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cccfa8d38ba7271361708783699b23e5/jiwezutifuduzejut.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/3911595291.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6834eab7380f5dd363f9c5fed08ac796/28133547819.pdfIn PDF document text
- http://hitecds.com/userfiles/file/3022701929.pdfIn PDF document text
- http://sambometal.com/dataroom/file/5326460929.pdfIn PDF document text
- https://eitmedu.in/ckfinder/userfiles/files/kepige.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/cbusd847ftgpjg79a78qs3k3hi/pevafawenakitedi.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097471bb862b---22387832061.pdfIn PDF document text
- http://sherwoodchambergolf.com/ckfinder/userfiles/files/wabopades.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160eddcdcd4157---46579733095.pdfIn PDF document text
- http://deurenhanger.nl/userfiles/file/55447800993.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+outside+hitter+volleyballPDF 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_off0001a79b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A79B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001bfad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BFAD	18480 bytes
SHA-256: `71b1395e3712da7127b81fcac4c61f90faf470ac1154a210dc64ae077136ed31`
`font_02_sfnt_off0001f04c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F04C	10712 bytes
SHA-256: `2b9461d01828af5546c1d265deb5ab5f096ffb7b80518895d2c9e961237fe15e`

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