PDF malware analysis — malicious · da352cb9ebfa7836

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 03:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 871eab852318ec5d68fd1171c80c339f SHA-1: 48442ad363c562cebcfe441e735ef0d2e9e5d366 SHA-256: da352cb9ebfa78363645f23eefe229fed00883ea088664ed9b4bc33cbf4b14d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDF files hosted on compromised websites. This suggests a phishing or malware distribution scheme, where users are lured to click on links that lead to further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db85fd6b29a7e11ecc2e56dc13063a8b/53719451968.pdf In PDF document text
- https://noithatkuongthinh.com/uploads/files/xokipukotonuxupuvimal.pdfIn PDF document text
- https://prokoncept.hu/admin/blogfck/image/file/12631685178.pdfIn PDF document text
- http://aapltd.net/userfiles/file/vemimexilodireletojorudun.pdfIn PDF document text
- http://stylekd.ru/files/rapebakuvadosufereweg.pdfIn PDF document text
- https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608768504728c---54243419488.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9ced783752ed37efa1606971938d845/xafemebekezopokudok.pdfIn PDF document text
- http://ooexperience.be/assets/Image//files/53292734565.pdfIn PDF document text
- http://beepost.vn/upload/userfiles/files/74385551874.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c30f24e6---dimozi.pdfIn PDF document text
- http://euro-ex.com/jifimuw.pdfIn PDF document text
- https://kudamatsu.org/userfiles/file/25219022030.pdfIn PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8630e872c621f20e2845ec73fc2b0546/15136784163.pdfIn PDF document text
- https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/75994635760.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782579970b2---gubugoruzeko.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4v9mip6nqte0dt9lbd45aujpmq/71436269570.pdfIn PDF document text
- https://agrolliance.ca/ckfinder/userfiles/files/rarotifamosurevenapiwuzeg.pdfIn PDF document text
- http://jevades.com/aircraft/fckimages/file/10051253042.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9df90275d3fd04fe2fd2dbf2462d9f0d/28868939910.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1815cf84e3dad9396f784f3f0a39830d/95526048460.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc10d032a---96027176626.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301c849202---nawojonajaserate.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0fe265e1---zidepid.pdfIn PDF document text
- https://iwistw.com/upload/files/matasevig.pdfIn PDF document text
- http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/117ce4e3f6a4f88a38c39c687c9e181a/72246824220.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160721df7109c5---69047914799.pdfIn PDF document text
- https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/86f7e624193c7d0e88e4eaac26d35ed2/98257466787.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=left+eye+itch+meaningPDF link annotation
- 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_off0000fd25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011537.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11537	16924 bytes
SHA-256: `03d4f8a575022d59247fcd1360ec64e1ee671067d0d840cd62e9332d4c2d0072`
`font_02_sfnt_off0001414d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1414D	10420 bytes
SHA-256: `ecac46df9dd7a295055c4eb8394b89baa97bf17e6a8b37bf847c490b82adccac`

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