PDF malware analysis — malicious · b31b88b1a63db9a6

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 04:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: cd9f60dda70a654975d67a5dd8e466e0 SHA-1: 6f1c13d206bcb4c6860617a45231d1e7b7e50231 SHA-256: b31b88b1a63db9a6596837715ac3a246a3c65faf18f03f22ae5f96c8aff9c8ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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=medios+y+fuentes+de+reclutamiento+pdf PDF link annotation
- http://csptech.net/admin/userfiles/file/jonafugejavutikuronoxeme.pdfIn PDF document text
- http://urjabatteries.in/userfiles/file/12140882845.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87326551ae---jibijusakilebatuxapeko.pdfIn PDF document text
- https://biorenta.lt/ckfinder/userfiles/files/3451498546.pdfIn PDF document text
- http://englishkan.net/UserFiles/File/60832088910.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eeb40a61dccccf57e9341a1b0523e6ec/19369392721.pdfIn PDF document text
- https://laptopserwis.com/app/webroot/media/files/31180778360.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a12962f5ae64f3145dca907d65d0974e/21769360289.pdfIn PDF document text
- https://webvitamin.vn/app/webroot/uploads/files/2884905956.pdfIn PDF document text
- http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/87602269709.pdfIn PDF document text
- http://wskinbody.com/data/boardData/files/56477967400.pdfIn PDF document text
- https://rewaqousha.net/userfiles/files/46987170887.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a886350c4bd---99058374300.pdfIn PDF document text
- http://wdnederland.nl/file/nonika.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/07072e0c38706a43c82435c9e8cf7448/60049280834.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ca78e4e3---89301526683.pdfIn PDF document text
- http://cioccolatogallucci.it/userfiles/file/9817720112.pdfIn PDF document text
- http://le-bouquet.be/userfiles/files/wupanejefo.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fbd600dfe---49005191506.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a490cd7b---90309103034.pdfIn PDF document text
- https://mavibusiness.it/file/6911646081.pdfIn PDF document text
- https://studiopros.com/userfiles/file/In PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f644c1e65---11194347536.pdfIn PDF document text
- https://novitas.ro/files/1961240031.pdfIn PDF document text
- http://studiofagiani.eu/userfiles/files/tixebovipel.pdfIn PDF document text
- http://biblioteka-belzec.pl/upload/files/vitixidimod.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_off0000dc6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC6E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f480.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF480	19264 bytes
SHA-256: `4bfcb08c3db94b6181f84e0016fd2ef0aa171d0595f929d0469de77cf9349e3f`
`font_02_sfnt_off00012607.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12607	10988 bytes
SHA-256: `ea7338af5d0157f14064dbd2e40102a66010bb69c90203560e5f05e41748d3e1`

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