PDF malware analysis — malicious · 12d3de408ecedce8

MALICIOUS

PDF

75.8 KB Created: 2021-08-27 23:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8f60e24baf4f87d4e540f75a044dcf65 SHA-1: bb0ecfdce13f82cc7c8f8294f4cadcf390f94975 SHA-256: 12d3de408ecedce8c305edafae133f9df0e109a448a9e528e2e854bac64a4d8d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=seventh+day+adventist+preaching PDF link annotation
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160931daa5086d---93171783657.pdfIn PDF document text
- https://banghenails.com/upload/file/xutodereninep.pdfIn PDF document text
- http://terredellamagnagrecia.com/userfiles/files/25670812568.pdfIn PDF document text
- http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/29082421017.pdfIn PDF document text
- http://shuimotongyuan.com/userfiles/file/nozubemerugugofudixomumit.pdfIn PDF document text
- http://muszempilla.com/files/file/muzawubusez.pdfIn PDF document text
- https://inncredel.com/uploads/60309727115.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee152e248e---94287102509.pdfIn PDF document text
- http://ibtaker.ps/userfiles/file/28074159964.pdfIn PDF document text
- https://www.gico.ge/ckfinder/userfiles/files/fadukuzanuvuziferalanubol.pdfIn PDF document text
- http://vidol.nl/userfiles/file/durimalimivuluvonizi.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/54gj3ta0io8icu6anj03g1ou77/2696899428.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/286hrvfk394qr3qf1gf9cdaop8/5841272828.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e1a23150c44d65e668c2a781d1b700c1/63409546245.pdfIn PDF document text
- http://www.rpv-drachten.nl/files/file/wupivekugagut.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fd36d859---93944894635.pdfIn PDF document text
- http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4815447810.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfe8bd2de---63951547231.pdfIn PDF document text
- http://commune-bourre.com/userfiles/file/79732407318.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c5805b27cff447d596287e1f80c0637b/nudidisasudorozozemepibu.pdfIn PDF document text
- http://donateagift.eu/userfiles/file/19939832658.pdfIn PDF document text
- http://cesishotel.lv/res/wysiwyg/file/rimumijubupatupulipe.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aa87c8b0f7a4f36028d4841aaace483f/50145331885.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_off0000c524.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC524	10880 bytes
SHA-256: `878f65da8b4364464abd707562c0de7057ab2cc377cd6bc675ebac4fb3e6bddc`
`font_01_sfnt_off0000de10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE10	16992 bytes
SHA-256: `fec5cc7f23945d38576c5b84ca9010b42bb8f349d8dbf04fa9f7095b171d16bc`
`font_02_sfnt_off000109f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109F8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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