PDF malware analysis — malicious · e3af527290f098e0

MALICIOUS

PDF

85.8 KB Created: 2021-08-11 21:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ed84a6d1b9f91aa9c2a3c4807d3017e9 SHA-1: 3bfa99feba6b60d0924728218d06d97140e75fa3 SHA-256: e3af527290f098e0f2e0db0068a4ccddab9ac17909552e7f182e2eae782d117d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://svazekobciorlice.cz/userfiles/file/30816421025.pdf In PDF document text
- https://beysukonaklari.com/ckfinder/userfiles/files/konamumajapuz.pdfIn PDF document text
- http://krzeptowski.pl/file/27727812057.pdfIn PDF document text
- http://cualuoiskydoor.com/webroot/img/files/vinikalobogabosubivoba.pdfIn PDF document text
- http://prestinoequitacion.com/imagenes/upload/files/59766866349.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea83b03bd---56296386636.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b909447124---8707412946.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/wajufok.pdfIn PDF document text
- http://nhatminhtrading.vn/app/webroot/uploads/files/721581066.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c932ee84---27159911998.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/54ac48b73acf99d4d275f65be7e8cf05/bosinuretebir.pdfIn PDF document text
- https://tipresentoio.it/images/file/80698531334.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2bd3d27ec---bulaxiganovari.pdfIn PDF document text
- https://cissud.it/uploads/ck_editor/files/49731333545.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160827d7c4be60---11081615637.pdfIn PDF document text
- http://phantasos.org/userfiles/file/magofa.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e2a24279a---nitulejowilujixopod.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6129a879---71538734210.pdfIn PDF document text
- https://hogozaty.com/ckfinder/userfiles/files/94671684554.pdfIn PDF document text
- http://ytovietnam.net/ckfinder/userfiles/files/fiwibavabob.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ecc0beac---jiboferevavejipisapuluj.pdfIn PDF document text
- http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a867674f13f---93219721278.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/687891653036c77e97f8c88fab04d97e/66331075038.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0b9d3e7c0f3a62e931816ea8b11c881c/87364065914.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9043d69a---8140440061.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/16860849207.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=indoor+pool+dehumidification+calculatorPDF 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_off0000e9ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101BF	18100 bytes
SHA-256: `09bbfff6a2c693ba8e4f4caa850583dcfc2f168ef1555ac2e8fb174fb745d032`
`font_02_sfnt_off00012fce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FCE	10768 bytes
SHA-256: `38f900ea9355dc8d744b52ca3fb7c37bffabd8c1b2a198856d0aad41532cc4c3`

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