PDF malware analysis — malicious · 42493777cf4e159a

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 02:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: d7b0c95f395498fa13caeb1ebc23827f SHA-1: c97bdd440c93c4bac0f850d433e9730459117117 SHA-256: 42493777cf4e159a890d9ce01c31637954f8bc359a2fc774984c84284c0d7d24

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use link farms. The heuristic firings indicate a pattern of linking to compromised CMS uploads and SEO-based link farms, suggesting an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://chcial.ru/uplcv?utm_term=stoic+ethics+pdf PDF link annotation
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc96daa32a---3322735036.pdfIn PDF document text
- https://jobtiara.com/files/files/fitilopekak.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/809289b833fd81640bc14602d9e64089/77933006166.pdfIn PDF document text
- http://111-orte.de/testarea/cwsCMSlight/media/files/44449552672.pdfIn PDF document text
- https://songod.vn/uploads/image/files/3355561231.pdfIn PDF document text
- https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/f171f2226351b862089a5f8900e7d91d/tukireto.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609033ade038b---xaresegefizobarojutabadeg.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a9ed728d92a3a77de2f5fa20b3b6a8d/nixedemodozimo.pdfIn PDF document text
- https://opsclown.it/ckfinder/userfiles/files/lefejidujirujavedozu.pdfIn PDF document text
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jt1rb6f7tluhnpgma5bn889ke2/48490086452.pdfIn PDF document text
- https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/11688641646.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7512aa8aec9f2dcc0adfb22ac2dabc45/vurof.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7140f03aaeb87ee466a48d2b44d55bcf/33738977742.pdfIn PDF document text
- http://orchid-daikanyama.com/userfiles/file/64978289482.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170cdf3a592---8969103991.pdfIn PDF document text
- http://studiodebiaggi.eu/userfiles/files/32142785473.pdfIn PDF document text
- http://skiflogistics.ru/userfiles/file/53196459116.pdfIn PDF document text
- https://nabsangram.com/userfiles/file/ligarokosor.pdfIn PDF document text
- http://jenistudio.com/upload/FCK/file/93731418102.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db2df9e2f2ebfed545369ee46411d632/96090920970.pdfIn PDF document text
- http://studiomanzella.com/userfiles/files/wisudoremaxe.pdfIn PDF document text
- http://jubileejec.com/userfiles/files/nuremewajoxadudabarutinuk.pdfIn PDF document text
- http://synerfreight.com/syner_upload/images/files/kajotasibufebuw.pdfIn PDF document text
- https://f27szerviz.hu/upload/files/vozegiporogajonifimumu.pdfIn PDF document text
- http://agrocare.hu/ckfinder/userfiles/files/pufosuwogumapifaxuroru.pdfIn PDF document text
- https://suativisamsungtaihanoi.net/upload/files/guvaba.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_off0000b9ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9EA	10380 bytes
SHA-256: `e958074b97a74bc0c80f2218217ad79cfe529daecd591369e7c3a36847106678`
`font_01_sfnt_off0000d187.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD187	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e999.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE999	15432 bytes
SHA-256: `d30fd012c1f6d5c53ec254d36cc8c9b864caf0fd215509ef937d1669b9752353`

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