PDF malware analysis — malicious · fd6f752819c9c426

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 12:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 592b60523d06513de97ed379df48e237 SHA-1: 8cfcc100049be045a197c3298481b07163335179 SHA-256: fd6f752819c9c4265647465fbc23ce99e1624fed9c46eeb00f965642caa3bd50

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a deceptive link structure.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d67b6ad0e3b170b4a1311aba461c8d62/38948535952.pdf In PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c037f087---risal.pdfIn PDF document text
- http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/lixufapobikonebumol.pdfIn PDF document text
- http://popnmusic.fr/userfiles/file/pasitu.pdfIn PDF document text
- http://americanewbie.com/userfiles/file/39280352691.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0bae8ef9846e72f581be4bc4f50f8041/65844026166.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c29643cea---1010274130.pdfIn PDF document text
- http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/57212075612.pdfIn PDF document text
- http://poongdung.com/FileData/ckfinder/files/20210620_0FA2DFC08CF2F9AF.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9e3c264ee563e640454fcf8082480d22/15973176324.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccf0d573d---72047206736.pdfIn PDF document text
- https://ckmusicdesign.nl/userfiles/file/zageroketewuja.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e74a5f384---16409336278.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaba01247---95742167682.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6558a6ec0---tanesilo.pdfIn PDF document text
- http://yuemeism.com/uploadfiles/files/mimagekikexovuwa.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713c56e80a8---kebolamaninivazerusepin.pdfIn PDF document text
- http://asfalon.com/__files/file/sonabawitumadazuk.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8cc5d5ad---56621986624.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/s0shkvsa5sr8il8u2hkuql8q41/tofimivebejusabuka.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c9f04586---bejateleme.pdfIn PDF document text
- http://koszyczarek.pl/userfiles/file/favovuzutetirunimewunu.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf5798f03---jivejiz.pdfIn PDF document text
- https://lapalettedesarts.fr/gestion/file/muzetoxejetuboxigokarevij.pdfIn PDF document text
- http://pensjonatagat.pl/userfiles/file/83429901580.pdfIn PDF document text
- https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865b226507a---8447589736.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/4023756768.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+the+sky+is+pink+onlinePDF link annotation
- 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_off0000f1b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1B0	17804 bytes
SHA-256: `f265eebc67aac0199484f2392982e30aba677f888579d35ae3d6631c9c925a7e`
`font_01_sfnt_off00012040.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12040	10572 bytes
SHA-256: `39ad89ac3b462a7d71e5e7da0db6661867b5765df022451d993ee5f9ceae278a`
`font_02_sfnt_off00013869.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13869	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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