PDF malware analysis — malicious · fbc4e68c03bce903

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 11:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 508178a4c5cc51eb6dfc8703e322a501 SHA-1: 82e02e5afacabd0afb2d09b07fdcdc3481921f13 SHA-256: fbc4e68c03bce903c0b0d8a1eaa5dd028e43b3f6935bdbcd764e2a94982a7d39

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088478c8c6d5---50810058233.pdf In PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3c0aee3842d1aad52cd242ab3f281567/4810042682.pdfIn PDF document text
- http://poiskvod.ru/images/file/82673711957.pdfIn PDF document text
- http://notarbrazda.cz/userfiles/file/93115228842.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a87c315ef18---30047199347.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/glgo4k8en7tc39re18f6d7cbt5/21660267175.pdfIn PDF document text
- http://edgecs.net/documents/74401553627.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1970785a18---47167615329.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a5c3e046---kijavosawara.pdfIn PDF document text
- https://tortugafilms.ca/adminfiles/file/75336874997.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ef562c28ef6ae719755a41a9d7fc4f74/43573677271.pdfIn PDF document text
- http://tafoto.de/img/upload/files/vepinu.pdfIn PDF document text
- https://decoveinvestment.com/userfiles/file/51773459394.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5fa4e6077aa82d292a60caceb375ab18/vupinidemejeg.pdfIn PDF document text
- https://hotellemaritime.com/hotel/upload/files/74758451519.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d3f119d1d---tupegefirewej.pdfIn PDF document text
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/puaagrp78ikormr004nm5cclpv/22998248584.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/g90e0halep02c8s4nagr2rjlu5/56881032374.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd8c05ae8---8617600376.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3eeae7a0f---99740869127.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/723821df3f3491ca2ca577466961f707/31474358358.pdfIn PDF document text
- http://boxethai38.comupload/file/gorakelijegisimemiwobopuz.pdfIn PDF document text
- http://a-swiss.com/upload/userfiles/file/9386251693.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=daddy%27s+birthday+young+thug+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00011bfd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x11BFD	17428 bytes
SHA-256: `eef65d9138f656781ddda612893b32921e29a3c9050c9bb6f8e0053cda612b99`
`font_00_sfnt_off0000d575.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD575	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED87	17656 bytes
SHA-256: `f891a3487050d6c501d74b1738d03f3312ce38d4cdd2328073f8cc9e974eb03e`
`font_03_sfnt_off0001363d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1363D	11356 bytes
SHA-256: `751ba1275555a2393bc06d25c0b106a7274930a4b04ace662adbca118f71863b`

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