PDF malware analysis — malicious · 87c564073995071b

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 19:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2c9909cfd76e623e8ef3481a9a106003 SHA-1: a506422b0070aef34eddf49732f70112b4bb09eb SHA-256: 87c564073995071b221ca14c68d806db63f7750ffdf8f41633996d14db6f1a00

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farms on disposable hosting indicates a clear intent to redirect users to potentially harmful destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

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://nomylo.ru/uplcv?utm_term=manual+tablet+multilaser+m7s+lite PDF link annotation
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d9ff669d92ef9724ced83e67356a3bac/25935698778.pdfIn PDF document text
- https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a7e462da30677f242ad50c7b3d83fd7c/59258687793.pdfIn PDF document text
- http://maekuangudomthara.com/ckfinder/userfiles/files/xixegidejered.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda44d69d37---53734846033.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b483cf961dc---83984477736.pdfIn PDF document text
- http://theaterbuehne-schwandorf.de/userfiles/file/julunanakidil.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6a5a44849166491b6268e7d2bee4868d/vijodoge.pdfIn PDF document text
- http://sun-tes.ru/files/file/29556993686.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0966f4d32a---nazatinobolinawiboki.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/au0o3d6nhkhk5abpsrvuqk74c0/xuwidifofatup.pdfIn PDF document text
- https://curewelldiabetes.com/userfiles/file/tixezibogusolazakaburipi.pdfIn PDF document text
- http://elcampoeco.org/FCKeditor/file/18703580649.pdfIn PDF document text
- https://anmimar.com/royal/userfiles/file/3845568983.pdfIn PDF document text
- http://morpheus-architects.com/file_media/file_image/file/34452159852.pdfIn PDF document text
- http://easyliveconstruction.com/ci/userfiles/files/nodigegudepituseruwupa.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3e447d362a6bcb00783aadc14677e0a6/bifumiwapesa.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3c28e2f9235adca5152e410957326a65/60535767865.pdfIn PDF document text
- https://zbmbudomont.pl/userfiles/file/pinedegazat.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/64420988846.pdfIn PDF document text
- https://pmeds.us/userfiles/file/96689211179.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb23c0813---ponupifulipamilan.pdfIn PDF document text
- http://bearings-home.com/userfiles/file/xajor.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/kumug.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb47056a17---zurojezedowi.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11fe57b7d---delebisibidada.pdfIn PDF document text
- http://topaslt.com/userfiles/file/mebowoki.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_off0000c749.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC749	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF60	10432 bytes
SHA-256: `a6de1e2b7cff0ee67c23604dd6b3b116764e4e7ffc546572515b6dba15934e81`
`font_02_sfnt_off0000f702.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF702	19056 bytes
SHA-256: `84da2cea4e1f9cad9433a5b4671907e06fbb47f963827957523ecca70b89a44a`

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