PDF malware analysis — malicious · a86d15a09f3c9420

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 06:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d2d5995ce362f85bdd35714b0b607737 SHA-1: 8d2192a773144d3d2244563dde8bfe88b0bbdc67 SHA-256: a86d15a09f3c9420af5b207159f02b993a5615a7f516b386840ff7903ec08661

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing structural elements indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160eff353b3d5c---rodekize.pdf In PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161269929dbae4---88090302118.pdfIn PDF document text
- https://rosewoodcity.org/nbloom/fckuploads/file/9525974630.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43bfdcaa08---gogugoni.pdfIn PDF document text
- http://dichvutheapec.com/upload/FCK/file/80807022755.pdfIn PDF document text
- https://bloomland.com/sites/bloomland.com/files/mosafalana.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/849ca5a410cd923e691c84b01406fa6d/fikiwisuminatekugipib.pdfIn PDF document text
- http://dothi.info/images/files/sanoruxipamajegoxorusodo.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/aab6f8cb2d578674eee93a74e8d7301f/4441836526.pdfIn PDF document text
- http://paraglider24.de/pics/fotos/1/file/32179693058.pdfIn PDF document text
- http://secretlove.ch/ckfinder/userfiles/files/57499884885.pdfIn PDF document text
- http://montagnobozzone.it/userfiles/files/nifuvirepexibidog.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b6d8eb58---vejupo.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2bf296c48---rotiges.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/846c407dcf5794f9c10151e45cf27bd0/dibewivanefumujibezere.pdfIn PDF document text
- http://cn-junsheng.com/upload/file///2021724113699955.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/90250e45322a4901d1f7fa00a7bd1896/rulatugidob.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/aei3cs3r2drcfj6joffprorpm2/serafozofifegopipesizizab.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gm9vdrthh5h4mbep5obov3h47n/texatavanalavubozad.pdfIn PDF document text
- http://ahrestygz.com/userfiles/files/20210717_170244.pdfIn PDF document text
- https://hobbes-group.com/upload/files/38678684155.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/eb2429347f9cda09935aa220b990d1d2/lolenugedujekev.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ffcbe79d---buwivorimidedasupujerud.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afce84b7b4---80964089833.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d16c6b9b---9632291202.pdfIn PDF document text
- http://zsdbiopharm.com/upload/files/36884054778.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hedonismo+definicion+pdfPDF 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_off0000ca59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA59	10364 bytes
SHA-256: `628cd0ed75d16fa0673ee24f59b4e8d44f53732be523337e3df64de5c8817932`
`font_01_sfnt_off0000e1a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1A4	18916 bytes
SHA-256: `ea84d65f9428473a430a30e953348782ab80a66437d9fe2a6d17a87dc6351edb`
`font_02_sfnt_off000112c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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