PDF malware analysis — malicious · 4c302e758acfca89

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 15:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 163ca9d468f921045068f2d25ddf2848 SHA-1: 5ae805444f94476e860d1ae14b9b057b37fcebf9 SHA-256: 4c302e758acfca8909511a21fca57eb2ebc60f69326b508cfec680903cfadc8c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file 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 ML classifier strongly indicates maliciousness, and the presence of external URIs points towards a potential phishing or malware distribution attempt. No scripts were extracted, but the structure and heuristics suggest the primary goal is to drive traffic to attacker-controlled infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

Heuristics 5

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://smidgel.ru/uplcv?utm_term=vitaminas+y+minerales+pdf+libro PDF link annotation
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1bf91ca1c---71985745007.pdfIn PDF document text
- http://telecycling.org/files/file/5400150931.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/v0kk7on275dtd9qpcqr06p53rc/gijoget.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/37530352835.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc34dbc89---94517676907.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16109d25d17688---lakulabijubuverizerisarax.pdfIn PDF document text
- http://adria-ex.com/images/blog//file/73777685301.pdfIn PDF document text
- http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/84669276901.pdfIn PDF document text
- https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/13e0c76bc63c73f3405bb29e368ab051/vamufiwezafuvit.pdfIn PDF document text
- http://swaminarayangm.org/userfiles/file/botovewezemeru.pdfIn PDF document text
- http://gsprojekt.eu/userfiles/files/95102138423.pdfIn PDF document text
- http://limeitec.com/upfiles/editor/files/xanigilokuzos.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/423b2ccdeeded3721a7475fd5f4580c3/96131004736.pdfIn PDF document text
- https://fleschimmo.lu/userfiles/files/nuwurebilogezofobug.pdfIn PDF document text
- https://tecnibat.net/uploads/archivos/62018213644.pdfIn PDF document text
- http://babywagen24.de/userfiles/file/29774983895.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/09d5e369f02ce36fb358255b3610c9d1/10269917605.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/65262667.pdfIn PDF document text
- http://tandartsindex.nl/images/uploads/puvazinewibumibitopogo.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/64dd60e2fd83aaab990fa6c8d55d62dc/15422230910.pdfIn PDF document text
- http://bhartiyambeohari.in/userfiles/file/34503773421.pdfIn PDF document text
- https://crownprolaw.com/userfiles/Proj_Name//files/pepomul.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd9048ea8c---10912438461.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c9ae9c0b---wumesefeserixiwepesavipa.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a5b891827---1496471407.pdfIn PDF document text
- https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/db7c348f98ff65f7387bd6254dd91f99/208778628.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c96adef312c---vunezukizatijavulebegotub.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_off0000c6c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ded6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDED6	18620 bytes
SHA-256: `e0489fdde12e749c50b922153570f3c246929ad00e7040a6bcb3df81357d5a95`
`font_02_sfnt_off00010e36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E36	10884 bytes
SHA-256: `228de3ef424ba09ce8611086da09f75ea35080d7fcec21846ed96fef1ada3ff3`

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