PDF malware analysis — malicious · 7859343156e4fa75

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 16:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 660823ef2aa2a8c4fd0d86116846391c SHA-1: 84894aba71e6c5bb0b430d74bd17f667598317ed SHA-256: 7859343156e4fa75fae67cdb0f6d4519e9f7ae75ab5c9f7ba7ef1b882b3e12a4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=present+continuous+exercises+elementary+pdf PDF link annotation
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f3462ce1b6f6402754f40fc012209ed4/widur.pdfIn PDF document text
- http://fygl.net/uploads/file/07160830515.pdfIn PDF document text
- http://systempro.kr/userData/board/file/nepizipamozetesa.pdfIn PDF document text
- http://wdnederland.nl/file/54108512660.pdfIn PDF document text
- https://wedding-photos.cz/userfiles/file/34941226816.pdfIn PDF document text
- https://www.colline-eternelle.com/ckfinder/userfiles/files/63609408997.pdfIn PDF document text
- http://gaia-onlus.org/userfiles/file/35609345585.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1390e817d59f638c29873ab2a4c839e8/zatifafajemokuvigakati.pdfIn PDF document text
- http://jumpstart.mobi/ckfinder/userfiles/files/gowaxanuzutokigenolubige.pdfIn PDF document text
- https://biblioteka-koneck.pl/ckfinder/userfiles/files/71943487020.pdfIn PDF document text
- http://le-nora.com/userfiles/file/99246391581.pdfIn PDF document text
- https://ferest.ro/imagini_ws/6944295129.pdfIn PDF document text
- http://gimhaejazz.com/fckeditor/userfiles/image/mujadisafo.pdfIn PDF document text
- http://allamericannursing.com/userfiles/file/20224886665.pdfIn PDF document text
- https://piti.leaddeehub.com/userfiles/files/73424253633.pdfIn PDF document text
- http://kuryakyn.ru/userfiles/file/ropokupovuteb.pdfIn PDF document text
- https://lanjutpt1.com/contents/files/jujagegev.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda391ba2b---86522769033.pdfIn PDF document text
- http://jonellchem.com/upload/files/gawunujovulopawagu.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/2017663080.pdfIn PDF document text
- http://effektfilm.de/files/file/79929742717.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_off0000d3aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3AA	11100 bytes
SHA-256: `eac09fc02fbd516c27e008d8bb37577d9f82010068b0d18a7b9a120a8d090d4b`
`font_01_sfnt_off0000ed9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED9A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000105ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105AC	18520 bytes
SHA-256: `69e8185687bfa41eebec8978794b17195abd395669b3ebea2da42881e17ea2a8`

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