PDF malware analysis — malicious · c51650ccbf2b8a6e

MALICIOUS

PDF

82.7 KB Created: 2021-08-13 23:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 45110f8e9ac54b2bfde5fa6f0b310ef3 SHA-1: d6b2dcaa0bda5053220cfb33364bc286f74c94f2 SHA-256: c51650ccbf2b8a6e1aa97c4edcaeb70dc0f645b3df974e4874c9735fb8d1a801

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 5

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9adeb4e6---2335300172.pdf In PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fd7848615899e8329fb75c19886f155e/84819508829.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/50e90be57fc8a6bfbf40c2717be593c4/57258774199.pdfIn PDF document text
- http://sangiorgioautoservizi.com/userfiles/files/33662897681.pdfIn PDF document text
- http://windmill-bv.com/userfiles/files/vifumevikavipinoxa.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09b5c0e2b---74091785350.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a6fb7497ca22d71a57e841a450cd1ba5/34315416486.pdfIn PDF document text
- http://jarauwerdaenzn.nl/userfiles/file/5942380934.pdfIn PDF document text
- http://bajcsidavidfoto.com/_user/file/86364237106.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c703dc6e05---jitufegudakepasojexobo.pdfIn PDF document text
- https://dcmheavyequipment.com/admin/images/file/musiximizetupunibogul.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/94845032e4bc739f1a81269a53b8b702/femavigiguzadusugex.pdfIn PDF document text
- http://okulsanmalatya.com/imgup/file/9320419497.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/nidizelowinovo.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6a310dae1---75156408978.pdfIn PDF document text
- http://hotelbelleepoque.bg/userfiles/file/bilelugowenu.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/dcfaa6727069e176107f14f652453bc8/vupip.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1dcb2bf1---51728929855.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4826f50d---88087644206.pdfIn PDF document text
- http://ranaghatpchsschool.org/userfiles/file/zoguzerafanafakoga.pdfIn PDF document text
- http://zge-led.com/luodan/images/userfiles/file/80277070599.pdfIn PDF document text
- http://kiuanai.com/userfiles/file/lixaju.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b50222632d1---34762477286.pdfIn PDF document text
- http://www.irrv.org/uploads/files/13273136501.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9e9cfd67d4ede866b7e36d740efd79b8/folujabuxuboxisesoripa.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e249d0d3---19009172585.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=plantilla+de+pentagrama+para+imprimir+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_off0000e0ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0AB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f8bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8BD	17588 bytes
SHA-256: `e3ba8754e71c9fcdfb3578d6dbefcbf3b2f64c7bf7503ab6e9d0bd31a3da7316`
`font_02_sfnt_off0001254c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1254C	10552 bytes
SHA-256: `13f288da410778ae4f4d62e834516ec896da191498fde3fd678481052a514e98`

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