PDF malware analysis — malicious · 80d628dbe780d0b1

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 22:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04

MD5: d549b0b65f1405eb3d13819ad674a773 SHA-1: c76d8185a03f58996984cf88f295b124df009db4 SHA-256: 80d628dbe780d0b16c5c2a7364f51733bb6f186c5914fade39035d16b53f412c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

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://coretry.ru/uplcv?utm_term=how+to+combine+pdf+files+online+free PDF link annotation
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c979b114a5e297761ed3b439682e3f73/jikej.pdfIn PDF document text
- http://prunay-en-yvelines.fr/ckfinder/userfiles/files/wogula.pdfIn PDF document text
- http://businessdevelopmentcenter.pl/uploads/userfiles/files/mubimufejipulekuradin.pdfIn PDF document text
- https://thefertilizergranulator.com/d/files/53019990553.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739e0cd92b3.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dnkd1l1hrqj87dgcckupgr1243/jezixowevolene.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac119229209---90550522753.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8f264cc8---4692098621.pdfIn PDF document text
- http://xn--80aab8aioy.xn--p1ai/userfiles/file/jawuluvuru.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8608afcb159a241b1668b16f776df741/66594109246.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nboqqe0kil6h09afp1fqdacjmt/gunolibudoja.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a45b1fce7486fe1ef4ed55702dd3a22d/vutedu.pdfIn PDF document text
- http://vinacafe-dalat.com/Images_upload/files/51150866911.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/62432876280.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6805628ee6---80412663914.pdfIn PDF document text
- http://bige.vn/uploads/userfiles/file/44647001952.pdfIn PDF document text
- http://wajl.net/img/file/202171482422.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9a6354f9ff8ffd43c4a17c2248d01f46/43175190755.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/gejojezepub.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80268c41a---41139950829.pdfIn PDF document text
- https://rivieresoceanie.com/ckfinder/userfiles/files/65027789645.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l387008eheeg1r95ubub7ivj74/zopojabuxowikul.pdfIn PDF document text
- http://simonhoirup.dk/userfiles/file/85907286353.pdfIn PDF document text
- http://apple888.vn/luutru/files/3724688126.pdfIn PDF document text
- http://caopump.com/admin/userfiles/file/4183117515.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_off0000ceb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEB4	10836 bytes
SHA-256: `3ec9729cd85c84014d2c99703b5b338c341988d5005db28c1a8ea16ecbd09c30`
`font_01_sfnt_off0000e771.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE771	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ff83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF83	16540 bytes
SHA-256: `97304c81f47279145ab4ec0ab59c29070d31ed69b91cefdcc3ff1f42e6b05435`

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