PDF malware analysis — malicious · 7059881b115d2013

MALICIOUS

PDF

99.9 KB Created: 2021-09-17 11:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 2087b062c27f3e53a6a5707424470337 SHA-1: 203efa3925b5d1f798ca85ebd29740b241757aa1 SHA-256: 7059881b115d201363631ff65a668a7a4d2ee6532e36b6aa052c9547e5e12edc

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, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm intended to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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 http://sprinter-lab.ru/content/File/9839013552.pdf In PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2f706766f945678f069c9528ee5c4dc/89448489374.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d2e13d40---gonemuza.pdfIn PDF document text
- http://epoxidice.ro/mm/file/42957880794.pdfIn PDF document text
- http://adacu.org/userfiles/file/20210914040727.pdfIn PDF document text
- http://wajl.net/img/file/20219160263.pdfIn PDF document text
- https://pomacanthe-art.fr/imagebeforeafter/files/51726976725.pdfIn PDF document text
- https://mondoaudio.it/img/uploaded/file/81963506553.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a333719f6bc6dd07a51cadf12700cd7/kawuzagi.pdfIn PDF document text
- http://www.sosonomo.com/ckfinder/userfiles/files/7644959007.pdfIn PDF document text
- http://dolekkoyum.com/admin/UserFiles/file/zisitoni.pdfIn PDF document text
- https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/wumikubaluruwijat.pdfIn PDF document text
- https://pergamine.com/ckfinder/userfiles/files/mipinesaronosuna.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2345bd227---tonogepegabupubaw.pdfIn PDF document text
- https://rafautama.com/uploads/file/90053458998.pdfIn PDF document text
- https://muacash.com/webroot/img/files/20199571481.pdfIn PDF document text
- http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/e13ef7e33dc73ab913acd73cd042413f.pdfIn PDF document text
- http://cosmikkino.ru/sadm_files/28126195611.pdfIn PDF document text
- http://onishi-kyosendo.jp/archive/12758808202.pdfIn PDF document text
- https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/womozolariri.pdfIn PDF document text
- http://www.tiande-global.com/ckfinder/userfiles/files/gefovowinafefik.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314dcc96c3b---27322575531.pdfIn PDF document text
- https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/396811f66336bd2e167c42a9ab23e583/69849630624.pdfIn PDF document text
- http://datavincity.com/uploads/ckfinder/files/kimabomusupolejenudopum.pdfIn PDF document text
- http://sziazsauto.com/uploads/files/winew.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=throne+of+glass+free+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_off00012049.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12049	10548 bytes
SHA-256: `9760c783cd29c1c9a1439ee07ab98ee4b2d9e5c334e8136f77a6d261fe6ff48d`
`font_01_sfnt_off00013809.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13809	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001501b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1501B	19040 bytes
SHA-256: `e881bc90ae139c65ba6d0e6c9e40e5822c9c0307c471905476e8d8ebe066a1ea`

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