PDF malware analysis — malicious · eb82f4dade3d0a2a

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 03:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 18186213d8b523e96f3e58769a2edbf7 SHA-1: f6c5e71010c7c7d1446b0d119518805998fb8524 SHA-256: eb82f4dade3d0a2a3f5e676610d3b2e8da1da0618a1039f884f28d871d7bc4f7

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous links to potentially compromised WordPress sites and disposable hosting reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9429

Heuristics 5

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
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=meiotic+division+stages PDF link annotation
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65672b5090---28064381503.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pt3m187ns01evicb6h3vd3kbq5/midobesodopi.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/99730888826.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c713b73fac---vobebijokutinalusotesare.pdfIn PDF document text
- https://ecableapp.com/FCKeditor/FCKimgUpload/file/ximoleretiramexuve.pdfIn PDF document text
- http://coumert.com/images/file/lazavejo.pdfIn PDF document text
- https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/saladowez.pdfIn PDF document text
- http://constantcontinuity.com/membership/data/files/bodugadinuno.pdfIn PDF document text
- http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/rabidusiwuxeveloxumuvu.pdfIn PDF document text
- https://subded.org/userfiles/file/tadokewupaxa.pdfIn PDF document text
- https://exam11.menapoint.com/app/webroot/upload/files/wemuzizovilenubiza.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef2e5a61b0---nekabikuxexerowakipa.pdfIn PDF document text
- http://dekoblickfang.de/userfiles/file/jumotefipozet.pdfIn PDF document text
- http://0vote.com/ckfinder/files/jitagagekojifima.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/befa5a9c2a81bd477299f7fca6744150/perogaku.pdfIn PDF document text
- https://turasmobilya.com/img/editor/image/file/41041036460.pdfIn PDF document text
- http://penzion-u-zamku.cz/files/file/lufexeke.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608735fee1edb---vofexuvurewekabuwe.pdfIn PDF document text
- http://www.hussco-steel.com/husscofiles/files/pelibuwamozujexerojew.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d7fd8ad3---54011006913.pdfIn PDF document text
- http://exima.kr/userData/board/file/53774807955.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3b70475b1---54707606898.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/6741954107.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a1h3g9m0ulcdeiugl03gikodm4/zabogojowuvig.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f0a59cf1---35510395109.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d4fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4FC	10460 bytes
SHA-256: `1ca701aa09f0698303fd8d2a2328398a7ccd4f1e2c72c7f9545cca1c943e1e30`
`font_01_sfnt_off0000ecba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECBA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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