PDF malware analysis — malicious · 3c8d4c7d947c807d

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 02:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 70123936f818b976f3f18fe7b38ecc58 SHA-1: 6e7a13080a473592c331e555b6092dc8825db3d9 SHA-256: 3c8d4c7d947c807da09899768cd12e6dd4131da9724acbf5bb127c25c66e4f72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to potentially malicious or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=physiology+books+pdf PDF link annotation
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a9007069f8359dbbd02cc8da5d1cf462/bedep.pdfIn PDF document text
- https://amatnieks.com/pictures/image/mifabibep.pdfIn PDF document text
- http://elma-itc.ru/!upload/files/97581240650.pdfIn PDF document text
- https://observatoire-omic.org/documents/file/97263193243.pdfIn PDF document text
- http://dgjst.com/upfile/file/walisomilulerujotirek.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86bd18671b---57400508445.pdfIn PDF document text
- http://ipceurope.com/assets/file/xusufedevifologelili.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ed986df9---luvutakune.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd68ce84b9---68622743888.pdfIn PDF document text
- https://iphonerepairservice.nl/app/webroot/files/userfiles/files/4299136231.pdfIn PDF document text
- http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/71886067522.pdfIn PDF document text
- https://festival.bg/fckeditorfiles/file/55996638196.pdfIn PDF document text
- http://wwstationery.com/files/file/25680059166.pdfIn PDF document text
- http://galantemontagnana.it/ckfinder/userfiles/files/76700780046.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/p1lfpicc2fj9vjim42rkvt3ob2/30439744139.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/e7pn9sal3tsjavvvil2i173asf/zatife.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1cfc34f379e4223ba51ecb6b622d2c7e/jufaja.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161000dbe1aee3---9098191765.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/al47da0iq7pok695s4kv63117j/46701500240.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/udsahcj4jv4pk2plhihg5fkpf4/1652347294.pdfIn PDF document text
- http://winecellarkeeper.com/ckfinder/userfiles/files/83156899836.pdfIn PDF document text
- https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/i5pal1gkqd2istdb7eudd39pto/17361126495.pdfIn PDF document text
- https://dragulf.no/files/file/wegatiw.pdfIn PDF document text
- https://mediaget.ru/userfiles/files/77002809260.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_off0000db01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB01	17432 bytes
SHA-256: `84dfc1f9cbfc12d1e7cbd29b22abba6b880ffcd5cda1eb21f236f6b6df0ab2c9`
`font_01_sfnt_off000108b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000120cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120CD	10528 bytes
SHA-256: `b2aac6f36a2544c37f3bff8982caf72d8e97603ddea1dabaff583db5f38a880d`

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