PDF malware analysis — malicious · 42fdf05c575105f8

MALICIOUS

PDF

76.1 KB Created: 2021-07-30 21:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: d4d6df7dc627c5e37a731256246a1508 SHA-1: 39eb67209bb36e36a8f60c16e17c86b7f8a9f0fa SHA-256: 42fdf05c575105f826c59f585a840c57b702ca5bd040c0e558d640b449ab6489

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `wkhtmltopdf` authoring application and the presence of PDF-specific heuristics further support its nature as a malicious document.

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://cructi.ru/uplcv?utm_term=manco+thunderbird+tires PDF link annotation
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9neo80aij44gmo55rphb0qr137/ravinena.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16092fc8ae0f7c---dezawulod.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1455a302fd---delavapoluvozajog.pdfIn PDF document text
- http://associazionemillesogni.it/userfiles/files/82112240871.pdfIn PDF document text
- http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/kuziwimojamafegusepez.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb48c8d21---71706053873.pdfIn PDF document text
- http://goddesshair.net/upload/users/files/dotetil.pdfIn PDF document text
- https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bidovut.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9c44e8b1---femojoni.pdfIn PDF document text
- http://iaestedresden.de/userfiles/file/85117455117.pdfIn PDF document text
- https://diaochue.vn/userfiles/file/88795229721.pdfIn PDF document text
- https://didacostruzioni.it/userfiles/file/88649639378.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078410ea0d18---zuzujabojenuvu.pdfIn PDF document text
- http://sistersaviopublicschool.com/userfiles/file/89826190487.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3ece922ad7cdf1232ccef3d612c05029/56795907147.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/90b4k8h71l020vnkc03bh37pol/43733111031.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d79850ec---mugorinoxunij.pdfIn PDF document text
- http://brezov-gaj.si/uporabnik/file/48852417021.pdfIn PDF document text
- http://aranykoronakft.hu/userfiles/file/95216081754.pdfIn PDF document text
- https://www.nvsrolko.org/ckfinder/userfiles/files/fojomatimunubupimato.pdfIn PDF document text
- http://alarcon-v.com/editor_upload_image/file/94618079587.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/838f8767846fa285aa6e35f45d2589c7/99215626255.pdfIn PDF document text
- https://netshopnepal.com/userfiles/file/96408057983.pdfIn PDF document text
- https://weboonline.com/ckfinder/userfiles/files/49937530074.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1dc350dac4---77207557444.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_off0000c7ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7CE	16048 bytes
SHA-256: `45004ab8666e1caccf58a2989a20cd2e0d0dda1e24611735569b65696e34446e`
`font_01_sfnt_off0000f114.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF114	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001092b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1092B	10656 bytes
SHA-256: `e25e0a5c73ef5d0b6d2968a7b44007bf6e2627259e93463eb780aadbcc4a42b5`

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