PDF malware analysis — malicious · 9712606bb1b29b03

MALICIOUS

PDF

80.2 KB Created: 2021-08-18 06:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ccb1926842145c5b280284a7b5b48836 SHA-1: b1b29a18f4bf8ae4dc82a9c5eee47467848af759 SHA-256: 9712606bb1b29b03fdaccaf8a06d898dcf66d698f6ad1af3cc9622fe7e82b8bc

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to deliver malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination by using numerous disposable domains. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://deborahkay.com/ckfinder/userfiles/files/40386497293.pdf In PDF document text
- http://rgn2u.com/userfiles/files/26481603789.pdfIn PDF document text
- https://bem-sa.com/img/file/25459192087.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b35e18cd2e2e9dc4d2a1fdfce889b8c3/putuxujobixoromusedut.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb54b369a---12351684286.pdfIn PDF document text
- http://zerosquareonline.com/file/3660907105.pdfIn PDF document text
- http://immopolignano.lu/images/99386952282.pdfIn PDF document text
- http://sincaremedicaltour.com/js/upload/saretipuniguwobunivulun.pdfIn PDF document text
- https://mwasafat.com/uploads/files/zirebaradasa.pdfIn PDF document text
- http://musclecar-taps.com/js/upload/files/mazusawunum.pdfIn PDF document text
- http://bagumul.com/file_upload/spaw_upload/file/20210608053031.pdfIn PDF document text
- http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sonudapikaxi.pdfIn PDF document text
- http://solartgaleria.hu/images/file/gowojakilerazobajofinoxek.pdfIn PDF document text
- https://jagamimpi.org/contents//files/wowewuzimubi.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac4f6dff4---95411877079.pdfIn PDF document text
- https://turkuazhost.com/calisma2/files/uploads/repinibiduvitebizosuronef.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/romazokejobevezojav.pdfIn PDF document text
- http://meskerjager.nl/media/files/50599954.pdfIn PDF document text
- https://espaciocultivarte.com/ckfinder/userfiles/files/88428020639.pdfIn PDF document text
- http://japan-railpass.info/images/blog//file/newokubidaravuzibin.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f672e0804---wowujebegakixefafovukiro.pdfIn PDF document text
- https://autoprofi.ua/userfiles/file/11710122797.pdfIn PDF document text
- https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/7j1u359do9ar70frvg406tkd8f/xorelokizesesag.pdfIn PDF document text
- http://runo34.ru/attachments/file/lawuvogubajimumirup.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=computer+operator+test+mcqs+with+answers+pdf+free+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d4a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ecb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECB2	16584 bytes
SHA-256: `ee968936f35ca0cb274e1a7b9e5d11b3dc9ade8ab7e4d80bd634f9e6597b9fe6`
`font_02_sfnt_off000117ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117EE	11248 bytes
SHA-256: `46ea5393df5a829febe8a856a3acf2a1d874e19e9852d660dffb9e36025b9807`

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