PDF malware analysis — malicious · 7b87e97f78bd9c7b

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 13:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: f7c1a5fda4d2b4e21cd19cd9667319b1 SHA-1: 4cc085cfbc4644ba3adc7601298c473b0503036e SHA-256: 7b87e97f78bd9c7bb9250d6fb3e3997d30a4b814aeda983fa7aadd771f40228e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest the primary goal is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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=to+thine+own+self+be+true+full+quote PDF link annotation
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a00ce8f33944ff854d333602f349fd99/84763556400.pdfIn PDF document text
- http://muszempilla.com/files/file/kegepovavapuwe.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/15d940fc7b866ee19a54e7cf4ec90111/3696660148.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e84750f7---53681189134.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/660a2c2ddb689b0d1085acdee0a0281f/pipezofovutiwadijused.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m7jstbmjqamrjhf4sbeg7a9r3p/vagilotebogudo.pdfIn PDF document text
- http://anandtouristcorporation.com/uploads/xesusejupudakid.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/chr7nh1rhof53o2bfj813imjr0/65774262885.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a7e699627---fasogevogebav.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608681d12018a---dapiwateriwobok.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/08884af4798f69c0700514e8b16128ce/89679931051.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bd8cae0383482bd245247edc67dd125/8828947486.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2301fcc9040f9e1df294d8fec8ae5408/21560398142.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/99bd3b3d7b315dd4bbf87ffe487a73ed/2108289174.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f1dd13d41d6f111d66ac594aec28e518/27738418765.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01ee748a2---fewoneradejenilufodobasov.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/21266295266.pdfIn PDF document text
- https://samavetpharm.com/userfiles/files/24228183017.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ace134c44---saxetibumugibimiwosada.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc513cbc549---42161535406.pdfIn PDF document text
- https://telenovella-bg.com/files/80314785426.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a82625f3501---jedifomerowexufutek.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/rufajiwedewugu.pdfIn PDF document text
- https://mangmalungtea.com/userfiles/file/94858194600.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_off0000e567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE567	10584 bytes
SHA-256: `7d81dbc34a5b33d22ceb801a342f4e77ad3137ee97852d84c9f6c85fe81ec2a7`
`font_01_sfnt_off0000fd90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000115a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115A2	17512 bytes
SHA-256: `72008f7c84668cb1eb3ea3acae40c6ae3a4b7d0824db7dc7d238adf876abd4a8`

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