PDF malware analysis — malicious · 132776378213e7d4

MALICIOUS

PDF

92.1 KB Created: 2021-09-03 23:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4f81a58e4ec3c84a56da3cdf08537b9c SHA-1: e5a34e89dd1696360ba9aed51632969bc995d166 SHA-256: 132776378213e7d48e2f067c8287d1564af1a6eed65d466f729d722c61e506f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of link farms hosted on compromised WordPress sites or disposable domains. The primary attack pattern appears to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a malicious intent to lure users.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=hotron+hr+100-2+manual PDF link annotation
- https://noithatkuongthinh.com/uploads/files/40367428851.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/368ddf587c6ca03a3d774762d8a73d65/69470335739.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/50v591r0gg9de61dv5rfh185jl/xosonajofulujetosupef.pdfIn PDF document text
- http://diamondsnspurs.com/clients/12200/File/67613571631.pdfIn PDF document text
- https://nsck-cykelmotion.dk/userfiles/file/jetawojuzasonogaw.pdfIn PDF document text
- https://alshamiltrading.com/alshamilfiles/file/varilodazusikekorigefewum.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/54745743597.pdfIn PDF document text
- http://interwork.sk/userfiles/file/pidosew.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3600d643---7345388677.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/pavixutafofipu.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092d578f2e50---47554272508.pdfIn PDF document text
- http://ferrocom-spb.ru/userfiles/files/siraz.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5fb2c5877e002c5716311331f9340f50/56611581565.pdfIn PDF document text
- http://jinistudy.com/_UploadFile/Images/file/41595821024.pdfIn PDF document text
- https://balaji-technology.com/userfiles/file/govuzazowividul.pdfIn PDF document text
- http://parilka.by/var/upload/file/wevapito.pdfIn PDF document text
- http://bukharaalpharetta.com/sites/default/files/file/tipumelobavemugogave.pdfIn PDF document text
- http://jandenzobv.com/image_uploads/file/7974798758.pdfIn PDF document text
- https://falconshipping-uae.com/userfiles/files/joxowiwokes.pdfIn PDF document text
- https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/094dd9f435b6b3d2c3f8fcceb1129b01/vojawopejevola.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d1696def---2946187919.pdfIn PDF document text
- http://terrietanaka.com/library/files/74294214534.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f34e28e841101491922d7f9e5664ef6d/8818285680.pdfIn PDF document text
- https://jordanadams.com/ckfinder/userfiles/files/62162736715.pdfIn PDF document text
- http://sb-78.ru/files/file/9475180923.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_off0000e6c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6C8	18304 bytes
SHA-256: `c1b2f94c4ea63391545da850ca5e5432c742a19ca21749fcd7dfef1ef98b40f0`
`font_01_sfnt_off000116e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116E6	19876 bytes
SHA-256: `0e07f32f6ccba8d405a9f3c1bf5a18d6d316882061a18a36b1fb8911778fcf93`
`font_02_sfnt_off00014a94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14A94	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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