PDF malware analysis — malicious · 3f3dd364ad11ac8d

MALICIOUS

PDF

87.1 KB Created: 2021-08-04 11:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e1809b1776238d511b8befa9c8af5ec5 SHA-1: 14cb9c5cb76c9605ad59933a85681c40aa705d45 SHA-256: 3f3dd364ad11ac8d477c9427888db4e33c7602ddfa1017f2c761020c9b88edc3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725b631499d---lifuwaxapiledoleteteja.pdf In PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a4b5ba913d1cb5a996a9518819eb4c36/kinudivunuxu.pdfIn PDF document text
- http://odnoklassniki-files.ru/images/uploads/files/73938794312.pdfIn PDF document text
- https://nsck-cykelmotion.dk/userfiles/file/wafavusen.pdfIn PDF document text
- https://shellserva.nl/docs/Image/file/samivatak.pdfIn PDF document text
- http://amuseonline.com/absite/userfiles/file/84580377789.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/39508329857.pdfIn PDF document text
- http://dongphuctqueen.com/upload/files/divowodunexut.pdfIn PDF document text
- http://childhood-matters.com/clients/49507/File/zefaduvijoziz.pdfIn PDF document text
- https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/ninexik.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e598cb5db---gowemu.pdfIn PDF document text
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/l3b5duiif06p6udamjfl0hesgj/13597205007.pdfIn PDF document text
- https://divinenine.net/userfiles/file/wiwadosekawetakofukimi.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/04kd6nua16i4j4dtu8t9aonnuk/jixoki.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/22270340970.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dad7912f5---95867077845.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d844ec3b---26656469721.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rshqughlmlq6ub67k134c3ram2/beralimefirigugapus.pdfIn PDF document text
- http://korvet-sp.ru/userfiles/file/ditixamegajokevudopadij.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4004d569fde4b43ab770621a5467d6b5/55147083559.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f9061427---12300569223.pdfIn PDF document text
- http://softwarefactory.nl/images/file/4387774748.pdfIn PDF document text
- https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/lv4temmfqu9dif2aia3lp4r6b3/8765170600.pdfIn PDF document text
- http://haisushitogo.com/uploads/files/89654445443.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c26658eed679bf768a6de0fa5fc460e5/gogukisufujobejimef.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf850e5ad60---wasotonuzuvo.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/848b613a9c065173733971eda522e66c/fovezatopexejulagipare.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba941cdff---zowonetojew.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=linking+income+statement+balance+sheet+and+cash-flow+statement+in+excelPDF 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_off0000ef93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF93	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107AA	11236 bytes
SHA-256: `55bd93d5e7e15093b44ab8ac78a42b560a16c558639f67c630d65d559e2eaf01`
`font_02_sfnt_off000121b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121B6	16824 bytes
SHA-256: `1361b5fa48e44d4715af4fa954e192b9855a4ba326c5c17128113a62b64d31e6`

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