PDF malware analysis — malicious · f874932f9393f9e3

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 11:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6ff5f4bd822d04245d616e7e8f97c381 SHA-1: 4255a5654a2b2f37e120e735d628ed73942f3069 SHA-256: f874932f9393f9e3d79ce4985cc118359b2afcc0a4f73321bac6cff0e44b86b2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=poultry+farming+egg+production+pdf PDF link annotation
- https://rajatotogroup3.com/contents//files/nibisubatalorefipufineg.pdfIn PDF document text
- https://spiuruguay.com/ckfinder/userfiles/files/paguxonovunotirimulufax.pdfIn PDF document text
- https://premium-house.uz/images/file/fuxorarusulafeseseruzum.pdfIn PDF document text
- http://toyotarent.hk/FileData/ckfinder/files/20210726_910B88762715EAD8.pdfIn PDF document text
- https://alexandrapanayotou.com/web/images/static/file/xirifirabulukulet.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/894aa5389532eaf48b2afcff88accf8c/14198265647.pdfIn PDF document text
- http://zonwering-nederland.eu/ckfinder/userfiles/files/tezewiv.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e85e5bb60---72030124406.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/sjn1hhb5o287am07ccovo14umf/98090429929.pdfIn PDF document text
- http://preiswerte-unterkunft-papenburg.de/mediapool/dabolovirikuwowok.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cada4e174---66131568533.pdfIn PDF document text
- http://karcannakliyat.com/userfiles/file/85309432613.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdfIn PDF document text
- http://ggmtc.net/userfiles/files/37254816091.pdfIn PDF document text
- http://ventexevent.se/uploads/file/zuwebab.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1ad9553d329245752de44d845007f053/zubukigefupoki.pdfIn PDF document text
- https://hondamienbac.vn/userfiles/file/fufabefu.pdfIn PDF document text
- http://haiqi-machine.com/d/files/41581257379.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7908d901b---42499985045.pdfIn PDF document text
- https://tidymoney.com/ckfinder/userfiles/files/72306395506.pdfIn PDF document text
- http://educasters.co/ckfinder/userfiles/files/zaxemo.pdfIn PDF document text
- https://icon-studios.com/userfiles/file/74036904312.pdfIn PDF document text
- http://weingut-suppan.at/files/6157427534.pdfIn PDF document text
- http://wine-paraphernalia.com/files/winep/_repo/file/80296960188.pdfIn PDF document text
- http://s292376414.onlinehome.fr/datas/imgmail/file/18810189034.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_off0000b40b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB40B	11008 bytes
SHA-256: `c4ada276aaf10e0b2063123274bc10110482c618cacccac51a76a84066747764`
`font_01_sfnt_off0000cd7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD7C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e58e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE58E	14904 bytes
SHA-256: `a9ef172b98b2543b5d11e7b9722d9d24040f858b63e125a3a3b911594049cd07`

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