PDF malware analysis — malicious · 515c144f3034d17e

MALICIOUS

PDF

89.7 KB Created: 2021-09-07 01:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 34a4011e19b07be6f21005af9734187f SHA-1: d63fc992c88f5d40528394e143f46340fa5116aa SHA-256: 515c144f3034d17e5706cc6fdce50219b3a242d85e901d3f3fedc24944d4041b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://synerhu.ru/uplcv?utm_term=ctet+math+pedagogy+pdf PDF link annotation
- https://avistravel.ro/userfiles/file/vuwefikoxakafaxukob.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084082d13b3d---biwozixega.pdfIn PDF document text
- https://ta-taiwan.com/app/webroot/userfiles/files/10689603562.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/03cb3bce23576f6d0b5473618a9f4845/96581124187.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/eq2h7ba99trlngds2vu0te1q8p/59846996775.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966719f38f5---51717395032.pdfIn PDF document text
- https://soudurelausiere.ca/upload/editor/file/92338134422.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d3b2f7822d4d30c52b0f405edf29b97/benizox.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/485a88b6528daa0d11d44a2be1195b25/7291555609.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaaa623a7c---ratebixojivasulajolifix.pdfIn PDF document text
- http://mayepnuocmia.vn/data/ckfinder/files/29028797930.pdfIn PDF document text
- https://cristalparkhotel.com.ve/ckfinder/userfiles/files/megexogokupigef.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3c018e03---dexowiwiberemafovikanus.pdfIn PDF document text
- https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/tafaradavepejajotuk.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bae0d2dcc507042c717e90df4c39b576/godexawunamatiluxogugoju.pdfIn PDF document text
- http://rilta.net/userfiles/files/2646445956.pdfIn PDF document text
- https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/eqvc5o17stnbudvhv6h6v1hqp3/86620775182.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4782520f0d4a9d42e598ada60efecdc5/13791124529.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/86804360989.pdfIn PDF document text
- http://aviatechinform.ru/sadm_files/vumogejunisuwosajukesawo.pdfIn PDF document text
- http://aldara-latinoamerica.com/userfiles/file/71176632345.pdfIn PDF document text
- http://seoulmenu.com/uploads/files/lidimigawinumopema.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2935255816ae90a912b0193d9633bd56/fomovosaperobadikapinew.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4144fb8f662099a4d71c8858bb7c2a27/lufakolanogejimukamosugi.pdfIn PDF document text
- https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/aeitb4h0psre431mqjitkqgkp6/benoronodor.pdfIn PDF document text
- http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/1774859574.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2tni0u1sdacmjle9nmkrgtheci/majuzenedovalelokudenipi.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_off0000f8b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8B9	10580 bytes
SHA-256: `a73f3e0a0f7f805f87b621fa29e7c1952ca39e24a442f97885d91172fbaec65c`
`font_01_sfnt_off000110b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110B3	18640 bytes
SHA-256: `782a2e767fd4ec8218958c4f949876d490b73df5ed3af948f86573d6a46eff4d`
`font_02_sfnt_off000140df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140DF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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