PDF malware analysis — malicious · 98c03f75cd94767e

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 21:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 1de1fca075915962a79de3ff3345f95c SHA-1: f0eeab042cb978dbc9c0c2075e8c6f16e2476fdf SHA-256: 98c03f75cd94767e9ceaf94199282ab6140550fccb308b3abc22e441b4c82e0a

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or trojan delivery mechanism. The document presents a fake CAPTCHA to lure users into clicking on embedded links, which are hosted on compromised WordPress sites and other disposable domains. These links likely lead to the download of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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 http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b7314844106---12014645596.pdf In PDF document text
- https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16212918152738.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160707f7ec7bee---4972623625.pdfIn PDF document text
- http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075585fa499e---fejer.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f1cb5bc4e1f5762a3f9e114b143d911d/juvodaporuruwoz.pdfIn PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c9b2d9d574e44516ba11dbf2c75b9a15/degudazugetas.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7e1d24a4---wirupetafosifivitesoposu.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/46cf9fa49d8450bd0629cab3a7eee260/67118848029.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cf68452180eed2e63a0eab37434aa60f/88714211721.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/aace15e3f63a72bb852c364ccbbd563f/6842347769.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb6b802b5d---jawike.pdfIn PDF document text
- http://mp-journal.com/media/file/64455941204.pdfIn PDF document text
- https://maturana.cl/upload/file/xivabulozabawov.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/94ba527a6c7491903f7eaf1de918f0e7/34878911879.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7bcef78---logisivijomo.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef3470875---zobazizu.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c442c7d0e4e---98023197373.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/03faa993854a265670c3f28bb07ebd67/19161258702.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6cdtfp20fkj5q657sdk7n4f1r9/51090747289.pdfIn PDF document text
- http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/37454946073.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2n234o0konnrbiet596aq3vj31/jusaxipexepigogotuk.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bf3785d4bad079c0b449734d33b6d2f1/18082971094.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ld4ook9cubnrchovbo5t5lipc6/12702832545.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vgqa9t9qvkpe98p317f22lnrbr/warubebunonej.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d9e3d689cdf9898cd9bee0f2cd4c5ff/93227330732.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b271646e4---56523687354.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+add+sound+bot+in+discordPDF 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_off0000edef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDEF	18252 bytes
SHA-256: `37d4ca1d64919115deb46ffc5b29af231901b027ceecf7716b4e2f639257c7f6`
`font_01_sfnt_off00011c8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C8C	10500 bytes
SHA-256: `0efcdd4e1a8d913074381fe177c81a5eb0ad3086c977b3c6a23ae58eaab72250`
`font_02_sfnt_off0001349b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1349B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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