PDF malware analysis — malicious · 33e001a8f993a851

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 18:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f302e14c2a29996c0354e2d02ade4e18 SHA-1: 1cc72bea4840002a648859a870c6e032be60751d SHA-256: 33e001a8f993a8510df33a095a15ee9648c5531681e76ed68be96dcf4ec6bc1e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=la+familia+de+pascual+duarte+pdf+english PDF link annotation
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3452f280---23699230740.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/37821519530.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8581520094---22425021025.pdfIn PDF document text
- http://aisef.org/uploads/userfiles/file/file/gakopurodilomojo.pdfIn PDF document text
- http://kaies.net/upfiles/210710150257059671pu5a9s.pdfIn PDF document text
- https://gulceoyunlar.com/calisma2/files/uploads/gutavuvojugadar.pdfIn PDF document text
- https://computerzone.pk/file/dopazezozebugusokexal.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d85238a9b---46317945668.pdfIn PDF document text
- https://aymexco.ro/ckfinder/userfiles/files/pekafejepij.pdfIn PDF document text
- http://keyday.ru/files/files/lanifesito.pdfIn PDF document text
- http://zeguvietnam.com/uploads/ckfinder/files/35670806772.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/956d4c0ef34fc464e0f2abd69dfb4ff4/deroretu.pdfIn PDF document text
- https://autoandtruckrepair.net/nbloom/fckuploads/file/luvixujor.pdfIn PDF document text
- https://ivanamihic.com//files/dogisaxawomegopetoba.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j3scl78jjjh97u635efr7ptu14/magukemonosezu.pdfIn PDF document text
- http://worldofpacifiers.com/editor_uploads/system/files/38503071257.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93f0ea59a---zevuvuwe.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f02485f2---sugeji.pdfIn PDF document text
- http://rococosofa.com/files/files/merijekuvinitup.pdfIn PDF document text
- https://anhhuynoithat.com/asset/files/zemiximelosa.pdfIn PDF document text
- http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1414146800609409122c524.pdfIn PDF document text
- http://www.hgbehringer.de/img/files/files/40622818733.pdfIn PDF document text
- http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foxomolumobafurilud.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/mc9d1vtjg0d3app864efjtvqa5/78368815055.pdfIn PDF document text
- https://golf-tout-terrain.com/publish/page/file/14800340290.pdfIn PDF document text
- https://alutat.com/data/file/wuvamanipedap.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_off0000e1fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1FA	21636 bytes
SHA-256: `564855df82a500ddccd2992f0676fceead95253f4eb07eaf09ef729320e18df4`
`font_01_sfnt_off00011908.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11908	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001311f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1311F	11004 bytes
SHA-256: `8b59c18a0f68c52f037d49bfbb7dc625c66692cd5fbd02c7308b168ef593b750`

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