PDF malware analysis — malicious · 666da41150caf062

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 14:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 62687a549ee37eec8f581d078b51ece8 SHA-1: 0083a593f829642ae78f624e7b19de69e2c63f40 SHA-256: 666da41150caf0621e1d74059988865cd4035cc1f96be2a30d15a1fe93a4177a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm its nature as a link farm, likely intended to distribute malware or facilitate phishing. No scripts were extracted from this sample.

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://pistant.ru/uplcv?utm_term=row+echelon+form+rules+pdf PDF link annotation
- http://portamarioarchitetto.eu/userfiles/files/33839282139.pdfIn PDF document text
- http://3wsystems.com/shipinc/userfiles/files/81005017056.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d227c00db57---307695632.pdfIn PDF document text
- http://stoewebdesign.no/userfiles/file/gotujelegupepodaledo.pdfIn PDF document text
- http://fouladsazanco.com/Upload/file/jexiguvixozugul.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16124e986316e3---56823361625.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/kimanepug.pdfIn PDF document text
- http://446888.top/userfiles/file/sonesipuw.pdfIn PDF document text
- https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/q8j1bn826gvs0agsq5hbheat9m/8263317049.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nt1m0ok52i12ehcvjgd227qkb4/25852494390.pdfIn PDF document text
- https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m9310p3a342e2vk3jvva8cajb1/8050197088.pdfIn PDF document text
- http://oskarmak.com/userfiles/file/18295040378.pdfIn PDF document text
- http://amandamaitland.com/images/file/mowetujexat.pdfIn PDF document text
- http://www.alfapilates.pl/upload/file/selovadeguweburul.pdfIn PDF document text
- https://zlataraburmevuckovic.com//files/18924592925.pdfIn PDF document text
- http://sigep60s-ncbeta.com/clients/44785/File/lakuvovigupasexa.pdfIn PDF document text
- http://longarmquiltacademy.com/fckeditor/userfiles/file/vopokogozez.pdfIn PDF document text
- http://baracenter.be/userfiles/file/98314344564.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8d7af82a---mokakumilidiverew.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e8c7b2c48005b6db75cce7bf56a3dad/nugofez.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a054842a0a---nalasigasikuza.pdfIn PDF document text
- http://zonwering-belgie.com/ckfinder/userfiles/files/berazedutanidikiwuwurik.pdfIn PDF document text
- http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ropoxiwibaxameli.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/3745393141.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a17e34dced---tazovinoketagutab.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/ledojejugubebubogad.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_off0000d498.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD498	10764 bytes
SHA-256: `e9d5a009ed6bc14b3ba465e3c242d9f91750da3ad8eca13039101357b9f2ab1e`
`font_01_sfnt_off0000ed39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED39	17512 bytes
SHA-256: `427c78b0d834f68dd77bb2b8a6860729a73f938a2b7e8d0fea1d359ce0994e98`
`font_02_sfnt_off00011b4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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