PDF malware analysis — malicious · 3e1e154be80be073

MALICIOUS

PDF

84.1 KB Created: 2021-07-12 23:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 1b29d360071bc33a3469f30f13b0610e SHA-1: 5ab10def392257e544287cd737fb30dafbab23b6 SHA-256: 3e1e154be80be0730e469381da4a2e4fb79716803e5ef29f7ad8aa403f35fc26

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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=list+of+common+names+of+organic+compounds+pdf PDF link annotation
- http://sport-way.ru/img/file/82944779049.pdfIn PDF document text
- http://tipiland.net/upload/file/49852413028.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb328f9e4---79124641171.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6d9de8c4c6ae61aa1cebc3005997d76f/21837601018.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/12110811624.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kalb58i5nvvkb79k2n5qgokav0/74722022720.pdfIn PDF document text
- https://monamifrance.com/FileData/ckfinder/files/20210619_DAE9C68C683A3A4A.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/844e78adcaa2f993b281c7fbdba3fa5b/86558664368.pdfIn PDF document text
- https://motacademy.it/file/mabafovetidi.pdfIn PDF document text
- http://feynburg-uhren.de/uploads/kemukujarobadevefiponab.pdfIn PDF document text
- https://szalkasszorutacskok.hu/app/webroot/files/content/files/womuxapuxorajukuzijoz.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6d45cc4a336914e00379cf3b4fff8ec7/17940198991.pdfIn PDF document text
- https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4cbac33bfab9858f2aa4d9ace43156b0/woxosirasedezarajanoj.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160982f51d6bf3---luzexodorazonefixib.pdfIn PDF document text
- http://brilliantsolarpaneling.com/userfiles/file/14596559013.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b361b27c4---tomut.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/18dd70be0470562e11a76e4269f9569c/53078920899.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf0dae559---dagapuzisavumebogofaf.pdfIn PDF document text
- http://odpadykj.cz/UserFiles/File/ginumesapivawilujesezo.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e0a8e69a1---4484769966.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/08c1f775638a88c4a7afef4c6237e64d/40232795419.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d450a994---lofigu.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7112da136---wugoremixituza.pdfIn PDF document text
- http://hakemokulkiyafetleri.com/upload/ckfinder/files/sidigibixivexonotexakudi.pdfIn PDF document text
- https://jairdefreitas.com/ckfinder/userfiles/files/bideferogolemajineke.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_off0000e65e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE65E	10976 bytes
SHA-256: `dd956064bafe7fbfee6ef2ff504008eead8f83da9202d05f39fa46a5918637ef`
`font_01_sfnt_off0000ff9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF9F	16628 bytes
SHA-256: `a7693cc09e0184d6326841772662fac0d86d606a8781fc6501c8707a7752d769`
`font_02_sfnt_off00012ad4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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