PDF malware analysis — malicious · 040160a5275b52fa

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 13:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2d294ae452f120253447b97fb1ba4751 SHA-1: 53a31ad7bd40dc88af37afce175f78473a058c53 SHA-256: 040160a5275b52fae9bb74e9373dc0ec856244783ac98fc1d7a9e2a12a286ec2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to distribute malicious content or phish credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/e2da829e52e8b8158f3c995117ea7e7d/gowomijinoritajo.pdf In PDF document text
- https://idd.no/ckfinder/userfiles/files/79079143396.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c695acc746d---28511268348.pdfIn PDF document text
- http://jfac.kr/ckfinder/userfiles/files/35412594256.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/afksnvb1lo9hsu1nu9qlua8n1a/23982956783.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e62818e3a---1864067196.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb18abe70---72761337714.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1c553259---57538736354.pdfIn PDF document text
- http://skikk.be/app/webroot/files/userfiles/files/jijonumozenimafave.pdfIn PDF document text
- https://consurs.ro/ckfinder/userfiles/files/vuzokogilaxakedizavo.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/edf8e0e4eaabd27d0d55cf517b97e92d/givugezimulezoxewewerusa.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/gokarekabode.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8c8422752c1420fe2f4dd184486b8722/13042885508.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e775910dd29a39580af3adc4e1055b65/92870915326.pdfIn PDF document text
- http://grandfiltr.com/files/file/57552304592.pdfIn PDF document text
- https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f707dcca5d1d90d3637b9656840dfb94/23541357846.pdfIn PDF document text
- http://solamsys.com/userData/board/file/74321916029.pdfIn PDF document text
- https://bem-sa.com/img/file/lixevojejik.pdfIn PDF document text
- http://asbu.net/uploads/FCK_files/file/minibexojewab.pdfIn PDF document text
- http://thuduchouse.vn/pics/file/66126969386.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca060a9a0---bigipabogupibowir.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d55e9e70---2689060648.pdfIn PDF document text
- http://makesomenoise.hu/upload/file/87385261781.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609312d3dc5f9---53700299548.pdfIn PDF document text
- http://amghanoi.com/images/ckeditor/files/60838498770.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mp1fj2rbjpm830b89aa4pqm2kh/losusazabugegunug.pdfIn PDF document text
- http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046c80ee46---nexisobotigogufitikusoti.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=methods+of+analysis+for+functional+foods+and+nutraceuticals+pdfPDF 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_off0000ea5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA5B	17852 bytes
SHA-256: `7d630c0a9e21f08ce7cae79ced48928ad174e3141b3ce05b4d97283713b4b8f7`
`font_01_sfnt_off0001188f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1188F	10924 bytes
SHA-256: `34ff638de4133d9b3792f9fc8f876a9f87ddf6aa89198647f12ab31a9dc90030`
`font_02_sfnt_off000131e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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